system
5
At 18MB the file is just a little over the default maximum filesize for sending to avast.
Open avast → settings → Virus Chest → change the “maximum size of file to send to avast” to 20000KB (20MB)
You will then be able to send to avast.
EDIT: It will take a while, it is with me…maybe sending in a password protected archive to virus(at)avast.com would be better
Scott