Part of the reasoning behind that would be in its name indicates:
PUP (Potentially Unwanted Program) so it entirely depends on if you knew it was installed. I would say this is pretty low level threat.
- The regular on-demand scans Quick and Full System Scans don't scan for PUPs (Potentially Unwanted Programs) by default, you have to have elected to scan for them ?
My guess on the reason they aren't scanned for by default is exactly because of what you did here, deleted the file as you feel it is a threat when it might not be. The greatest majority of files scanned in on-demand scans are inert or dormant, so don't present an immediate risk.
The resident scanner (File System Shield) can scan for PUPs (change Expert Settings) if you feel you want to know if one of these is actually run.
BundleInstaller - generally installed as part of a package, a pre-checked option when installing something else.
If you didn't install it or know it was present, then to you it is unwanted, so let MBAM deal with it.