From what I can tell, I believe you are getting a false alarm from your virus software. When I searched the internet, there are others having the same problem. Kaspersky is another anti-virus software provider and they have confirmed their software was detecting it as a virus by mistake:

Please check out the information on this page:

http://forum.kaspersky.com/index.php?showtopic=155379&st=20

http://forums.zonealarm.com/showthread.php?t=72951&highlight=show_ads%5B1%5D.js

I'll continue to monitor the ZoneAlarm thread(s) to see what resolution they have in regard to this file (.js file is a file that is being distributed from Google).