Are you actually using Avast and if so do you have another AV installed ?
If you have more than one AV installed at a time there is going to be a degree of conflict and one getting there first triggering an alert would prevent the second from scanning.
VT isn't simply based on a blacklist, Just have a look at the the other Tabs, Details and Links to see it isn't simply blacklist only.
Also based on your screen HEUR (heuristic not specific), plus Generic could well be an FP.
However there is nothing to stop you using the - Reporting a possible Malicious sample File or Website -
https://www.avast.com/report-malicious-file.php form.