While "b062.mp4" isn't currently a famous internet mystery, the naming convention (a short alphanumeric string followed by .mp4) is typical of:
(e.g., Discord, Reddit, or a specific website?) b062.mp4
Creators of horror "unfiction" frequently use bland filenames to make a video feel like a "found" or "forbidden" file. While "b062
(e.g., an ARG like Local 58 or The Backrooms ?) X50 Voice Name List b062.mp4
It is a multisampled sound often used for upbeat, orchestral, or percussive compositions. 3. The "Lost Media" or "Mystery" Angle