100 points
Category: Forensics
Tags: #forensics
The Network Operations Center (NOC) of your local institution picked up a suspicious file, they're getting conflicting information on what type of file it is. They've brought you in as an external expert to examine the file. Can you extract all the information from this strange file? Download the suspicious file here.
Inspecting the challenge file flag2of2-final.pdf for type, shows despite the .pdf file extension, png image data:
$ file flag2of2-final.pdf
flag2of2-final.pdf: PNG image data, 50 x 50, 8-bit/color RGBA, non-interlaced
Opening the PDF file yields the second half of the flag.
Copying the file with the .png extension and opening yields the first half of the flag.