Aetherion Dynamics
Description
Aetherion Dynamics | 50 points | By Thomas and Puhalenthi
Aetherion Dynamics is a cutting-edge company operating under the highest levels of secrecy. We've managed to get our hands on one of their top-secret memos, but it's redacted! You need to help us find their secret password.
Static resources: SecretFacilityAccess.pdf
Solution
Using strings and reading header details we can see that PDF contains an image inside /Subtype /Image
└─$ strings -d -n 6 SecretFacilityAccess.pdf | head -40
%PDF-1.3
1 0 obj
/Type /Pages
/Count 1
/Kids [ 4 0 R ]
endobj
2 0 obj
/Producer (pypdf)
endobj
3 0 obj
/Type /Catalog
/Pages 1 0 R
endobj
4 0 obj
/Type /Page
/Resources <<
/XObject <<
/Im1 5 0 R
/ProcSet [ /ImageB /ImageC /ImageI /PDF /Text ]
/Contents 8 0 R
/MediaBox [ 0 0 591.36000000000001 774.96000000000004 ]
/Annots [ ]
/Parent 1 0 R
endobj
5 0 obj
/Type /XObject
/Subtype /Image
/Width 2464
/Height 3229
/Interpolate true
/ColorSpace 6 0 R
/Intent /Perceptual
/BitsPerComponent 8
/Filter /DCTDecode
/Length 458212
stream
8Photoshop 3.0
%&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz
&'()*56789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz
""""""''''',,,,,,,,,,
└─$ binwalk --dd='.*' SecretFacilityAccess.pdf
DECIMAL HEXADECIMAL DESCRIPTION
--------------------------------------------------------------------------------
0 0x0 PDF document, version: "1.3"
571 0x23B JPEG image data, JFIF standard 1.01
601 0x259 TIFF image data, big-endian, offset of first image directory: 8
└─$ mv _SecretFacilityAccess.pdf.extracted/23B some.jpeg
└─$ display some.jpeg 
Flag: bcactf{n0t_S0_5Ecre7_ANyMorE}
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