Teaser Dragon CTF 2019 - BabyPDF
Sep. 26th, 2019 09:32 pm![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
mephi42Find the flag in the pdf.
Attempt #1:
Attempt #2: There is a seemingly compressed stream inside - use
Looks like an image:
The authors must have somehow messed it up - let's try deleting the first few lines and opening the file again.
Hey, the flag now appears! Like my friends like to say, "solved without regaining consciousness".
Attempt #1:
strings does not show anything. Oh well.Attempt #2: There is a seemingly compressed stream inside - use
qpdf to extract it:qpdf --stream-data=uncompress babypdf.pdf babypdf-uncompressed.pdfLooks like an image:
<< /Length 7983 >> stream q 1 1 1 RG 2.834646 w 2 J 2 j [] 0.0 d 4 M q 1 0 0 -1 0 859.889771 cm 66.855 230.531 484.289 283.93 re B Q 1 1 1 rg 107.43 485.855 m 107.43 499.855 l 115.43 499.855 l 115.43 497.855 l 117.43
The authors must have somehow messed it up - let's try deleting the first few lines and opening the file again.
Hey, the flag now appears! Like my friends like to say, "solved without regaining consciousness".
