I checked the file found below since I had installed nothing new but had a Steam Update just before this:
The file digital signature is Splitmedia Labs Limited: Signed Monday, August 17, 2015.
It was last access on my computer December 17, 2018.
From my research is it part of the Steam package installation dealing with video playback.
On a side note: the report says that scan option for rootkits is disabled. I just checked and scan for rootkits is on under Security.
Scan Date: 2/7/21
Scan Time: 8:45 AM