: If it came from an unsolicited message or a suspicious pop-up, it is likely a phishing attempt or malware.
Search results and technical data suggest several possibilities for why this specific string appears: Ppppppppppppppp mp4
: In many scanned historical documents or poorly transcribed databases, repetitive "P" strings appear as a result of Optical Character Recognition (OCR) errors when a scanner fails to interpret a pattern or image correctly. : If it came from an unsolicited message
If you have encountered a file named and were prompted to download it: Ppppppppppppppp mp4