There may be an easy wan and a hard way
this is the hard way but it works
make a new folder called "suspicious"
somewhere you can find it
like C:\suspicious
go into Avast and EXCLUDE this new folder C:\suspicious
export to or copy the bad files in the chest
(NOT THE SYSTEM BACK UP FILES)
to c:\suspicious
from there you can password protect Zip and email with most anything
(although g-mail and some others will complain)
you can also use C:\suspicious when you upload to virustotal and/or Jotti
handy hint
while in c:\suspicious do not inadvertently RUN them