Hello Ted:
Thanks for using ClamWin!
You should upload all false positive detections, like that Brother printer file to Clam AV, starting at
http://www.clamav.net/lang/en/sendvirus/ on the web. That web page has one link for false positive reports and another link for undetected virus reports. Clam AV furnishes the scan engine and signature database used by the ClamWin scanner, so they must take care of all signatures.
I reported the Brother file to Clam several days ago. They have not corrected it yet, so if you report it, that might help hurry things along. They might take a week or longer to get around to it. Most Clam AV signatures are now prepared automatically, but false positives must be worked manually, and, unfortunately, Clam AV does not have any full-time human sigmakers.
As for exploits, most AVs do not do that well at detecting them--especially in the early stages. I check any doubtful ClamWin detections on Jotti or Virus Total to see if Avast, Dr. Web and Nod32 detect them. These 3 AVs are usually pretty good at detecting exploits/adware, and I will believe a detection if they say so
Regards,