PDF malware analysis — malicious · 1dc2fc64569192a9

MALICIOUS

PDF

2.7 KB

MD5: ea9ce801ed71cda7529b91ac0e8e6144 SHA-1: c11372284ba2944e3c33415940e8144b6177787c SHA-256: 1dc2fc64569192a9197a29f9ee1b1c1652c7259e2c4e3046676a90f2f543b1b6

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript streams, with one stream exhibiting high-confidence maliciousness due to an eval() call and String.fromCharCode usage. The ML classifier also flagged this PDF with a very high probability of being malicious. The presence of obfuscated JavaScript suggests an attempt to download and execute a secondary payload, a common technique for initial access.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `cb9edd56570c797d846bcbe8c59b775b04b58bc5c3c232eb4a541ac3c5a998b7`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	372 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111712_001.js` `788e5d217304bbe6a5caa958c9c1afca3d68fdd31e739a83cde7c8424706e869`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x248	3032 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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