and why do you want to send it to avast when avast already detect it ?
do you think it is a false positive ?

upload suspicious file(s) to www.virustotal.com and test with 43 malware scanners
when you have the result, copy the url in the address bar and post it here for us to see

alternative
Jotti http://virusscan.jotti.org/en
VirSCAN http://virscan.org/
Metascan http://www.metascan-online.com/