I recently updated to a new antivirus software: Bitdefender 2013. It has quickly identified that hmhud.exe contained something it thinks is a virus: Backdoor.Generic.288866.
Its possible that this is intentional and not malicious, but it seems like a vulnerability.
I know over in the german community this was recently posted. A fellow PS member also updated (different software) and identified the same thing.
I've crossposted the link. I used google to roughly translate the page.
Original link:
https://forums.pokerstrategy.com/de/forum/thread.php?threadid=1454904