AngstromCTF2019: Blank Paper

The Challenge

Blank Paper Misc 30pts

Someone scrubbed defund’s paper too hard, and a few of the bytes fell off.

Author: defund

link: https://files.actf.co/26e1d969c6a7c21d973a64a67f74ea2695ee5b8743cd8f20d9ccde665bbfd368/blank_paper.pdf

The Solution

The PDF appears unusable to a large number of PDF viewers.

But the PDF viewers built into modern browsers are often a little more tolerant. Opening in FireFox reveals the flag: