PDF malware analysis — malicious · 4bd9bf0dd92af69d

MALICIOUS

PDF

7.3 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 282f077f4de0ba1c1296eeb128471146 SHA-1: 1992485200e940b1543c3ddbd95627e015ad6696 SHA-256: 4bd9bf0dd92af69d6a2c7726087e3fbacec5633d56e80a463dddd48205f532a4

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript uses eval() and string concatenation to construct and execute code, likely to download and run a second-stage payload. The reconstructed eval string is included as an IOC.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
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_obj0013_001.js` `6ca62d333c98bcb86ddd5f483a67f079b0a6968538a3f62a5a410e65f7d886aa`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3DC	5837 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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