Here are a list of the companies and how I've contacted them:
Avast Antivirus (instructions and e-mail)
http://www.avast.com/eng/technical_support.html
virus@avast.com
Avira AntiVir (form submission, e-mail)
http://analysis.avira.com/samples/index.php
info@avira.com
Softwin BitDefender
support@bitdefender.com
Dr.Web (form submission only)
https://vms.drweb.com/sendvirus
Frist F-Prot Antivirus (form submission only)
http://support.f-prot.com/index.php?_m= ... &_a=submit
G DATA
support-eng@gdata.de, hotline@gdata.de
ESET NOD32
http://kb.eset.com/esetkb/index?page=content&id=SOLN141
McAfee Antivirus (form submission or e-mail)
https://www.webimmune.net
virus_research@avertlabs.com
Rising Antivirus (form submission only, choose technical support)
http://support.rising-global.com/index. ... &_a=submit
Kaspersky
newvirus@kaspersky.com
This quote may be useful as well, from Avast's reporting procedures. Be sure to mention the password in your e-mail:
So far I've had a confirmation of false positives in the past by Avast and Dr.Web in less than 24 hours.The ideal way to send such files is to compress them as a ZIP file with the password 'virus' (so that the attachment is not deleted by some other antivirus software on the way).