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Sp4ce Inv4d3r5
Challenge
My favourite game in the 80s was Space Invaders!
Solution
Opening up the pdf we see the following:
Nothing to see with binwalk, so maybe the key is in the images itself.
A Quick google reveals the following space invaders alphabet
Simple transcription (or simply copying and pasting the text into a diffrent font, since it was text) gives us the key:
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he2022{Inv4d3rs_fr0m_sp4c3!}