When faced with your Web site being deemed to contain Malware, or a problem with Avast! (generally for Windows) blocking access to your site please report it immediately to Avast! Support [AVAST Software a.s.]
https://support.avast.com/Tickets/Submit/RenderFormI found their direct intervention the quickest way to resolve such issues, the forum next to useless.
Choose your ProblemSubmit a TicketGet a direct and fast response.Having a site blocked needs to be quickly remedied, it may cost you customers, exposure, etc. as is reasonable to expect.
The Direct approach I found technically pertinent in clearing the instance of a False Positive.
Using the Avast Support Forum cost time, lots of it, and custom.
I hope this may help others who may have a problem, as I once did .