HSF
SO to start with PDF forensic follow the procedure below
1) Run PDFID tool to find all the objects in the pdf python pdfid.py malicious.pdf
2) Now if u found a javascript run pdfextract(an Orgami tool) pdfextract --js malicious.pdf
3) else use peepdf -x for more details and -i interactive and in console run >object id
4) Or use ./pdf-extract malicious.pdf for viewing all contents inside the object
For this challenge you can solve in 2 ways first rin pdfid which shows it contains 2 js file and to extract it use pdfextrace
Or just use strings and use Octal converter to get the flag !!!!
First i tried with all possible analysis in steg but nothing was positive and then i cam to know that JPEG image is the only format supported by steghide and stand
a great chance the it has info hidden using steghide but to confirm it i tried stegdetect (but it resulted negative) i also tried to bruteforce the passphrace
BUt luckilly the passphrase was the chall title and i got my flag !!
We were given a vedio file so i opened it using audacity and spectrogram graph showed flag{} but text was compressed i tried few tools like amplify etc .. nothing
worked out finaly i tried to zoom it it worked !!!!