Can you inform the file as being a false positive? (click on the bottom right of the virus warning message).
To know if a file is a false positive, please submit it to
VirusTotal and let us know the result. VirusTotal has a file size limit of 10Mb. You can use
VirScan also.
If it is indeed a false positive, send it in a password protected zip to virus@avast.com. Please, mention in the body of the message why you think it is a false positive and the password used. Thanks.
Also, Dr Web failed to detect it too...