Hi!
This is very likely a false positive, but you can open the file with a text editor and check this on your own.
The userSetup has an impact on Maya, this is intended, and I doubt that a "normal" virus scanner can identity any unwanted behavior here.
But without knowing the content of this file I can't deny or confirm a problem.
If you want Maya related files and scripts to be checked automatically, please install the Maya Security Tools:
https://apps.autodesk.com/MAYA/en/Detail/Index?id=8637238041954239715