Hey Dennis, that particular jQuery file has a bitly URL in the comments. You may have heard, but bitly had a security breach and many services started flagging bitly URLs as malware. Here’s the first artilce that came up when I Googled the problem: http://thenextweb.com/insider/2014/10/25/chrome-firefox-flag-bit-ly-links-malware/
I am assuming that’s the reason that WordFence flagged that file. But, can you please send us a copy of that Javascript file so we can be sure? Also, since we’re chatting about it, did you get any other WordFence notifications? And or, is there anything that might lead you to believe your site has been compromised? Let us know…