What is strange is that so few, read almost none of the major players detect this, bitdefender is one and GData another, but that uses bitdefender as one of its two scanning engines (avast being the other), so that reduces those two to one, so there is still margin for doubt with only three detections.
You could try - Anubis: Analyzing Unknown Binaries, is another scanning tool that is useful,
Anubis: Analyzing Unknown Binaries and report the findings (results page URL).
Send the sample to
virus@avast.com zipped and password protected with the password in email body, a link to this topic might help and false positive/undetected malware in the subject.
Or you can also add the file to the User Files (File, Add) section of the avast chest (if it isn't already there) where it can do no harm and send it from there.
A copy of the file/s will remain in the original location, so you will need to take further action and can remove/rename that.
Send it from the User Files section of the chest (select the file, right click, email to Alwil Software). It will be uploaded (not actually emailed) to avast when the next avast auto (or manual) update is done.