If curiosity gets the best of you, run it through an online scanner like VirusTotal before clicking.
This specific naming convention (Provocative Subject + Number + Extension) peaked during the era of Peer-to-Peer (P2P) sharing apps like LimeWire and Kazaa. It became a bit of an internet meme because almost everyone who used those services eventually "downloaded a virus" that looked exactly like this. 4. How to Stay Safe If you encounter a file or email with this subject: Sexy Girl (286) mp4
If a user clicks it, instead of a media player opening, a script runs in the background. This could install a keylogger to steal passwords, turn the computer into a "bot" for DDoS attacks, or deploy ransomware. 3. A Relic of Internet History If curiosity gets the best of you, run