PDF malware analysis — malicious · 5528a95d66ad6785

MALICIOUS

PDF

4.0 KB Created: 2008-10-16 12:25:09 -07:00 Authoring application: Acrobat Editor 8.0 (via Adobe Acrobat 8.0)

MD5: d164373cce120ad317dbd824de0f17eb SHA-1: 84e539b494af5f74e18e5337f3b7d6c7136b58a5 SHA-256: 5528a95d66ad67851b1dae0cd7f098a753f7742e0599803fa73b26d76205e59a

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier with a high confidence score. Static analysis revealed embedded JavaScript streams, including one that utilizes `eval()` and `String.fromCharCode()`, indicating obfuscated code execution. The presence of these JavaScript actions strongly suggests the PDF is designed to download and execute a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0017_000.js` `29337eb1cc5183c20403a46b9ce15a5d0d18a5362f76119aec584e3bcdd032fa`	pdf-javascript-stream	PDF /JS object 17 at offset 0x2E8	3023 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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