The "shock" nature of the imagery is designed to be deeply upsetting and is often categorized alongside infamous "lost media" that most users regret viewing [3].
The contents are often reported to include illegal material that can carry severe legal consequences for possession, even if downloaded out of curiosity [2].
Some iterations are formatted as multi-layered archives (RAR files within RAR files), requiring passwords hidden in metadata or hex code, similar to "Cicada 3301" but with a much darker, more nihilistic tone [4].
This specific file name typically refers to a mystery that surfaced in fringe internet communities (like 4chan's /x/ board). While it masquerades as a simple collection of cat images, it is generally classified as or a psychological "rabbit hole" [1, 3].