The text string is almost certainly a filename for the animated short film "Bunny" (1998) by Blue Sky Studios, which won an Academy Award.
However, the “UPD” as a viral meme – that a corrupted file can alter your computer’s behavior – is pure creepypasta. No malware has been found in any sample. bunnythekillerthing2015720phinengbluray upd
Real file, abnormal naming.
An updated version of the 720p Blu-ray encode of "Bunny the Killer Thing" (2015), tagged with "phineng" by the uploader. Check Predb – Use sites like predb
The movie is frequently compared to early Peter Jackson or Sam Raimi—high-energy, low-budget, and completely over-the-top. While critics on Rotten Tomatoes warn of its juvenile humor and extreme content, fans of "trash cinema" praise its creative practical effects and its status as a "force of nature" in the horror-comedy genre. Where to Find It Bunny the Killer Thing (2015) - Comedy Horror Film Review which won an Academy Award. However
predb.net or predb.me. Search for bunny the killer thing.