If you have downloaded Electrum for the official website (electrum.org) then you should have read this note on the bottom of the download page:
Electrum binaries are often flagged by various anti-virus software. There is nothing we can do about it, so please stop reporting that to us. Anti-virus software uses heuristics in order to determine if a program is malware, and that often results in false positives.
There is no need to report this issue to devs team. They will most likely ignore it.
Verifying the signature does not completely rule out that possibility.
If you trust the signers (Electrum devs) and you have properly imported their public keys from trusted sources then verifying the gpg signature should be enough.