The Bitdefender AV Free file is AVCheck.exe. It is in the Install folder.
I have SAS Pro and during the installation of Bitdefender AV Free SAS Pro identified a trojan; i.e. Trojan Agent/Gen-Yoddos.Process in the AVcheck.exe file. SAS Pro quarantined the file. I then decided to upload AVcheck.exe to Virus Total and Jotti's Malware.
The Virus Total scan found one instance of malware in AVcheck.exe out of 44 AV scanners it uses. The once instannce was again SAS
Jotti's Malware sight. Out of 19 scans two found AVcheck.exe to contain a trojan The other 17 showed "Found nothing"
ClamAV detected PUA.Win32.Packer.WinrarSfx
CPsecure detected Troj.Downloader.W32.Aphex.020
For now I have left the file in SAS Pro quarantine and submitted a FP report to SAS.
Interesting that Bitdefender AV Free uninstalled Malwarebytes Pro during the Bitdefender AV Free installation. The installation process also disabled Windows Defender in W8 as it should. W8 had no problem with the forced disabling of Windows Defender. I doubled checked the Action Center and all was/is clear. My guess is that it was the code in AVcheck.exe that forced the uninstall of Malwarebytes and/or the disabling of Windows Defender that created the Malware warning in SAS Pro, ClamAV and CPsecure.
I was only trying out Malwarebytes Pro and had not yet paid for a license so no harm no foul on the forced uninstall.
OS - W8-Pro x64
Bitdefender AV Free appears to be working okay so far. 