This is not Autoptimize I'm afraid Philippe33, looks an awful lot like a attempted trojan-injection gone wrong (you're not the only one, lots of hits in Google when searching for:
r=eval;ps="s"+"p"+"l"+"i"+"t";function asd()
I think you'll find it inserted in /wp-content/themes/aquilo/header.php (but might be elsewhere as well), between
<meta http-equiv="Content-Type" content="text/html
and
; charset=UTF-8" />
Hope you can get rid of this nasty bugger.