PDF malware analysis — malicious · 7592201f2ff076b5

MALICIOUS

PDF

12.2 KB Created: 2010-10-06 18:52:43 +04:00 Authoring application: X_njFzp (via 4b7a5550)

MD5: 22fc8c57a7287b3a7c87fb001c95df64 SHA-1: ba7d1ac97a7af25458537cf15f6d7109f1f75e4f SHA-256: 7592201f2ff076b57888e032e66faeaee87d1b95a397aadd1b66acb0d72d5300

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly flagged this PDF as malicious. The JavaScript streams, particularly javascript_obj0011_000.js and javascript_obj0013_001.js, likely contain obfuscated code designed to exploit the PDF viewer and download a secondary payload. The presence of eval() and String.fromCharCode further supports this. The exact URL or payload could not be reconstructed due to obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `4e632aeb7f422bfbd7584a446679edb6132d611f3bed5a4b202f6b5b37e749da`	pdf-javascript-stream	PDF /JS object 11 at offset 0x245E	2359 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `54cc47b433ef4d779c4ddb830506b38fcca1e082e86f489fb3ba81d4b2fd9750`	pdf-javascript-stream	PDF /JS object 13 at offset 0x28A9	1190 bytes
`javascript_obj0015_002.js` `c524e62df3a449d126429fbc75986a9849ba80fdaa0fff102108f29dd25f9dca`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2B39	314 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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