There are five different files in this wonderful polyglot PDF. Spoilers ahead: - The PDF you see when you open the file normally, with a big REJECTED stamp

There are five different files in this wonderful polyglot PDF. Spoilers ahead: - The PDF you see when you open the file normally, with a big REJECTED stamp on the front page. - An HTML file, which is what you get if you open the file with extension .html or MIME-type text/html. This contains an SVG representation of the first page. - A ZIP file, which you can unpack by just running `unzip` over the file. This contains the various PoC code and other materials. And, two more extra-special files which you can get by swapping the first 320 bytes with the other prefix of the SHAttered collision pair (this changes the file contents but not the SHA-1 hash!): - A PDF which shows ACCEPTED and a coffee stain on the first page instead of REJECTED - An HTML file which contains a nice CHIP8 emulator.