We have lots of attachment that not detected as virus.
What happen ???
Maybe test the files on www.virustotal.com and send to Avast to analysis. Thanks.
You can use https://support.avast.com/support/tickets/new
it can be detected by clamav why not avast ??
yes it shows virus by some others not avast.
Submitting Malware Samples: https://www.avast.com/faq.php?article=AVKB258#artTitle