I would say that it is a false detection, considering that only one AV engine detected that file as malicious - and honestly, I have never heard of that AV. I can only confirm that I personally (like some other members) had similar situations when some security programs detected Electrum files as malicious, but it was always a false detection.

The only thing you can do (if you haven't already) is to verify the file through the procedure that you can find on this link ->

[GUIDE] How to Safely Download and Verify Electrum [Guide]