boss3.rar

I've regularly been receiving a warning that indicated the compressed file boss3.rar is a security threat and should be removed. 

 

However, when I try to apply the fix, NAV always says the fix failed - then if I try to close the warning, it asks if I really want to close while there are security threats unresolved.  NAV indicates the file is low risk.  Has anyone received this warning, is the file truly low risk, and how can I (if it is necessary) have NAV resolve the issue?  I am able to find the file but am wary of just deleting it from my system without knowing what it is and how it may have gotten onto my system...