Clear it in 3 steps
Start the environment
Investigate the target
Submit the flag
All challengesIn progress
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
Not started
Hints
Hint 1Show
Use pdfinfo or pdftk to inspect PDF metadata
Hint 2Show
Expand objects with qpdf --qdf --object-streams=disable document.pdf uncompressed.pdf
Hint 3Show
Run strings uncompressed.pdf | grep KINOCO on the expanded PDF