The string appears to be an or a scene release tag from a pirate website. Breaking it down:
The file sat in the corner of the server like a secret everyone pretended not to see: pulsion20141080penglishbluraykmmoviesvipmkv_upd. Its name was a code — a date, a format, a promise of something polished and dangerous. For Mara, who worked nights as a digital archivist at the Institute, passwords and filenames were her maps. She had learned to read them the way others read faces. pulsion20141080penglishbluraykmmoviesvipmkv upd