nop it's not a php logging library file or Prolog file

it's from some sorts of Steam password stealer encrypted log

plog file can be found here
Known to AV as:
* not-a-virus:PSWTool.Win32.Steam.ai [Kaspersky Lab]
* HTool-PWSFFox [McAfee]
* Virus.Win32.Messen.L [Ikarus]

still wana know how to read the plog file :-/