There seems to be a lot of problems with antivirus signatures improperly flagging JavaScript files in WordPress plugins lately and this certainly looks to be another example. As Sona said, the file being flagged was previously included in Joomla and when the comment text in the file is removed from the file, the Jiangmin antivirus does not list it as being Trojan.JS.aud anymore.
It would be a good idea to let your host know that this looks like a false positive.