0ld is g0ld
Once we unzip the folder, we get a password protected pdf file. Use pdfcrack in combination with rockyou.txt to get the password:
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pdfcrack -f 0ld\ is\ g0ld.pdf -w /usr/share/wordlists/rockyou.txt
PDF version 1.6
Security Handler: Standard
V: 2
R: 3
P: -1060
Length: 128
Encrypted Metadata: True
FileID: 5c8f37d2a45eb64e9dbbf71ca3e86861
U: 9cba5cfb1c536f1384bba7458aae3f8100000000000000000000000000000000
O: 702cc7ced92b595274b7918dcb6dc74bedef6ef851b4b4b5b8c88732ba4dac0c
Average Speed: 51086.5 w/s. Current Word: 'ashley76'
Average Speed: 51789.1 w/s. Current Word: 'aleyna17'
Average Speed: 51673.8 w/s. Current Word: 'treefrog23'
Average Speed: 52042.8 w/s. Current Word: 'rubiceltqmbogi'
Average Speed: 51936.8 w/s. Current Word: 'naysha11'
Average Speed: 51216.5 w/s. Current Word: 'lilmizhyper15'
found user-password: 'jumanji69'
Use the password and we can see this:
The picture is of Samuel Morse which gives you a little hint at to what is to come. At the bottom of the pdf, you see:
Use a morse decoder and get the flag