Clear it in 3 steps
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Start the environment
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Investigate the target
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Submit the flag
All challenges
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Hidden PDF Streams
Mission
PDF files contain multiple object streams. Find the flag hidden in one of them. Learn to understand PDF internal structure and extract hidden data. Provided file: document.pdf
Hints
Hint 1 Show
Use pdfinfo or pdftk to inspect PDF metadata
Hint 2 Show
Expand objects with qpdf --qdf --object-streams=disable document.pdf uncompressed.pdf
Hint 3 Show
Run strings uncompressed.pdf | grep KINOCO on the expanded PDF