Foro de elhacker.net

<Script Language='javascript'>

 <!-- MG-HTML Encryption  -->
<!--
document.write(unescape('%3C%6C%69%6E%6B%20%72%65%6C%3D%22%73%74%79%6C%65%73%68%65%65%74%22%20%74%79%70%65%3D%22%74%65%78%74%2F%63%73%73%22%20%68%72%65%66%3D%22%68%74%74%70%3A%2F%2F%66%6C%6F%77%64%65%62%61%72%72%69%6F%2E%6E%65%74%2E%64%6F%2F%62%73%2F%6B%2E%63%73%73%22%3E%0A%3C%73%63%72%69%70%74%20%74%79%70%65%3D%22%74%65%78%74%2F%6A%61%76%61%73%63%72%69%70%74%22%20%73%72%63%3D%22%68%74%74%70%3A%2F%2F%66%6C%6F%77%64%65%62%61%72%72%69%6F%2E%6E%65%74%2E%64%6F%2F%62%73%2F%63%6B%2E%6A%73%22%3E%3C%2F%73%63%72%69%70%74%3E%0A%0A%3C%64%69%76%20%69%64%3D%22%69%6E%74%65%72%73%74%69%74%69%61%6C%42%61%63%6B%67%72%6F%75%6E%64%22%20%6F%6E%63%6C%69%63%6B%3D%22%63%6C%6F%73%65%49%6E%74%65%72%73%74%69%74%69%61%6C%28%29%3B%22%3E%3C%2F%64%69%76%3E%0A%3C%64%69%76%20%69%64%3D%22%69%6E%74%65%72%73%74%69%74%69%61%6C%41%64%55%6E%69%74%22%3E%0A%3C%64%69%76%20%69%64%3D%22%69%6E%74%65%72%73%74%69%74%69%61%6C%54%69%74%6C%65%22%3E%0A%3C%63%65%6E%74%65%72%3E%43%6C%69%63%6B%20%61%20%4D%65%20%47%75%73%74%61%20%6F%20%45%73%70%65%72%65%20%3C%73%70%61%6E%20%69%64%3D%27%74%69%6D%65%72%27%3E%33%30%3C%2F%73%70%61%6E%3E%20%73%65%67%75%6E%64%6F%73%3C%2F%63%65%6E%74%65%72%3E%0A%3C%2F%64%69%76%3E%0A%3C%64%69%76%20%69%64%3D%22%69%6E%74%65%72%73%74%69%74%69%61%6C%4C%65%66%74%22%3E%0A%3C%69%66%72%61%6D%65%20%73%72%63%3D%22%2F%2F%77%77%77%2E%66%61%63%65%62%6F%6F%6B%2E%63%6F%6D%2F%70%6C%75%67%69%6E%73%2F%6C%69%6B%65%62%6F%78%2E%70%68%70%3F%68%72%65%66%3D%68%74%74%70%73%25%33%41%25%32%46%25%32%46%77%77%77%2E%66%61%63%65%62%6F%6F%6B%2E%63%6F%6D%25%32%46%66%6C%6F%77%64%65%62%61%72%72%69%6F%6E%65%74%64%6F%26%61%6D%70%3B%77%69%64%74%68%3D%33%30%30%26%61%6D%70%3B%68%65%69%67%68%74%3D%32%35%38%26%61%6D%70%3B%73%68%6F%77%5F%66%61%63%65%73%3D%74%72%75%65%26%61%6D%70%3B%63%6F%6C%6F%72%73%63%68%65%6D%65%3D%64%61%72%6B%26%61%6D%70%3B%73%74%72%65%61%6D%3D%66%61%6C%73%65%26%61%6D%70%3B%73%68%6F%77%5F%62%6F%72%64%65%72%3D%74%72%75%65%26%61%6D%70%3B%68%65%61%64%65%72%3D%66%61%6C%73%65%22%20%73%63%72%6F%6C%6C%69%6E%67%3D%22%6E%6F%22%20%66%72%61%6D%65%62%6F%72%64%65%72%3D%22%30%22%20%73%74%79%6C%65%3D%22%62%6F%72%64%65%72%3A%6E%6F%6E%65%3B%20%6F%76%65%72%66%6C%6F%77%3A%68%69%64%64%65%6E%3B%20%77%69%64%74%68%3A%33%30%30%70%78%3B%20%68%65%69%67%68%74%3A%32%35%38%70%78%3B%22%20%61%6C%6C%6F%77%54%72%61%6E%73%70%61%72%65%6E%63%79%3D%22%74%72%75%65%22%3E%3C%2F%69%66%72%61%6D%65%3E%0A%0A%3C%2F%64%69%76%3E%0A%3C%64%69%76%20%69%64%3D%22%69%6E%74%65%72%73%74%69%74%69%61%6C%52%69%67%68%74%22%3E%0A%3C%64%69%76%20%69%64%3D%22%69%6E%74%65%72%73%74%69%74%69%61%6C%52%69%67%68%74%54%65%78%74%22%20%6F%6E%63%6C%69%63%6B%3D%22%63%6C%6F%73%65%49%6E%74%65%72%73%74%69%74%69%61%6C%28%29%3B%22%3E%0A%3C%64%69%76%20%69%64%3D%22%63%6C%6F%73%65%41%64%58%22%3E%3C%63%65%6E%74%65%72%3E%58%3C%2F%63%65%6E%74%65%72%3E%3C%2F%64%69%76%3E%0A%3C%2F%64%69%76%3E%0A%3C%2F%64%69%76%3E%0A%3C%2F%64%69%76%3E%0A%3C%73%63%72%69%70%74%20%74%79%70%65%3D%22%74%65%78%74%2F%6A%61%76%61%73%63%72%69%70%74%22%20%73%72%63%3D%22%68%74%74%70%3A%2F%2F%66%6C%6F%77%64%65%62%61%72%72%69%6F%2E%6E%65%74%2E%64%6F%2F%62%73%2F%73%67%64%2E%6A%73%22%3E%3C%2F%73%63%72%69%70%74%3E'));
//-->
</Script>

Percent encoding. Es decir, es Hexadecimal con porcentajes al comienzo de cada string hexadecimal. (Abajo te dejo el link para que sepas como va)

Tu código decodificado:

<link rel="stylesheet" type="text/css" href="http://flowdebarrio.net.do/bs/k.css">
<script type="text/javascript" src="http://flowdebarrio.net.do/bs/ck.js"></script>
 
<div id="interstitialBackground" onclick="closeInterstitial();"></div>
<div id="interstitialAdUnit">
<div id="interstitialTitle">
<center>Click a Me Gusta o Espere <span id='timer'>30</span> segundos</center>
</div>
<div id="interstitialLeft">
<iframe src="//www.facebook.com/plugins/likebox.php?href=https%3A%2F%2Fwww.facebook.com%2Fflowdebarrionetdo&amp;width=300&amp;height=258&amp;show_faces=true&amp;colorscheme=dark&amp;stream=false&amp;show_border=true&amp;header=false" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:300px; height:258px;" allowTransparency="true"></iframe>
 
</div>

Más información:

• http://es.wikipedia.org/wiki/C%C3%B3digo_porciento (http://es.wikipedia.org/wiki/C%C3%B3digo_porciento)

PD: Por si quieres hacer tu tmb ese encoding aquí te dejo una función que hace algún tiempo atrás:

function perenc($str) 
{
	$newstr = "";
	for($i = 0; $i < strlen($str); $i++) 
	{
		$newstr .= "%".dechex(ord(substr($str, $i, 1)));
	}
	return $newstr;
}
 
function perdec($dec) 
{
	$newstr = "";
	$decarray = explode("%", $dec);
	for($i = 0; $i < count($decarray); $i++) 
	{
		$newstr .= chr(hexdec($decarray[$i]));
	}
	return $newstr;
}

Un saludo.

De nada, se me olvido comentar, que si tienes google chrome, puedes hacer lo siguiente coges en una pestaña nueva, y escribes tu codigo pulsando F12 dentro de la consola, y verás lo que es. :P

Un saludo.