This is an unusual codec or release group tag. It is an official video standard. In piracy circles, three-letter tags (like “PNF”) often represent the name of a release group or a scene uploader. It does not appear in any official media specifications.
The string "movies4ubidparmanu20181080pnfwebdlx26" follows a standard naming convention used in online media distribution. 🎬 Movie Overview: Parmanu (2018) Parmanu: The Story of Pokhran Genre: Historical Action Drama / Thriller Director: Abhishek Sharma Main Cast: John Abraham, Diana Penty, and Boman Irani movies4ubidparmanu20181080pnfwebdlx26