It's almost certainly a false positive.
A few virus scanners have given malware warnings for electrum over the last year. This is a thread about the problem
https://bitcointalk.org/index.php?topic=1639722.0One of the posts in it gives this virustotal scan result link for electrum-2.7.2-portable.exe
https://www.virustotal.com/en/file/5e7ecfb66f3fec010ff9ffdebb745550b6a550a87de4e0239d357f447ed19dee/analysis/1476074020/On 10 October virustotal scanned the file with 56 different virus scanners and the only positive result was from a scanner called Invincea.
I re-scanned the same file today through virustotal and the Invincea scanner said the file is now clean.
https://www.virustotal.com/en/file/5e7ecfb66f3fec010ff9ffdebb745550b6a550a87de4e0239d357f447ed19dee/analysis/1483120578/However now a scanner called Baidu is the only one of 56 different virus scanners to give a positive result. Ironically Baidu said the file was clean on 10 October.
The two urls prove both virustotal scans were of the same file because both of them contain the file's hash (shown below).
5e7ecfb66f3fec010ff9ffdebb745550b6a550a87de4e0239d357f447ed19dee
If there is only one positive result from 56 different virus scanners it's probably a false positive. If a scanner that gave a positive result two months ago (like Invincea) now says the file is clean it's almost certainly a false positive result.