Chapter 9 of 9 · Steganography 100%

📄 In 2023 JPCERT/CC found a file that was a valid PDF and a macro-laced Word doc at once, sailing past every PDF-only scanner. Could you spot the second format hiding in the same bytes?

Your .docx is a ZIP. Your invoice PDF can be a Word macro in disguise. You'll unzip an Office file, dissect a PDF with pdf-parser, and out a polyglot by the two bytes that betray it. One file, two formats, zero alerts. 🗂️

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Steganalysis and detection

Soon Available Aug 03, 2026

Steganography

📄 In 2023 JPCERT/CC found a file that was a valid PDF and a macro-laced Word doc at once, sailing past every PDF-only scanner. Could you spot the second format hiding in the same bytes?

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Course Progress

Course Chapters

Steganography foundations

Metadata and EXIF secrets

Appended data and carving

LSB image steganography

Steghide and passphrase cracking

Audio steganography

Text and whitespace hiding

QR codes and visual encodings

Document and polyglot stego

Steganalysis and detection