AVG Internet Security detecting Script:SNH-gen [trj] in word files

I have been using AVG Internet security for several years. I find recently it’s showing Script:SNH-gen [trj] alert in 3 word files and those files quarantine automatically. Two of these files have been in computer since many years. I did a deep scan of computer and find only three word files showing that issue. I know the files can be restored from quarantine.

I can’t understand why those word files showing that alert. These are some queries that I have.

  1. Is this a genuine threat need to worry or false positive detection?

  2. How can you safely use those word files in computer & ensure there is no threat?

Have you found a solution? Coincidentally, I’m currently experiencing a similar question. Thanks