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It’s Linux, running inside a PDF file.
“The humble PDF file format supports JavaScript – with a limited standard library, mind you. By leveraging this, [vk6] managed to compile a RISC-V emulator (TinyEMU) into JavaScript using an old version of Emscripten targeting asm.js instead of WebAssembly. The emulator, embedded within the PDF, interfaces with virtual input through a keyboard and text box.”
(via Fuzzix)
Tags: via:fuzzix linux pdf hacks emulation javascript emscripten tinyemu