Some anti-malware software, actually, do this but those are rather called
HIPS than anti-virus. E.g. the free Comodo Firewall has a built-in sandbox which, as far as I remember, has a semi-automatic community-driven online database of whichever file is or isn't malware and you can also submit (I guess, only the checksum of) your own "suspicious" files there. Such sandboxes to become common is, I think, still a bit into the future, especially for fully automated ones.
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Joe Forster/STA
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