PDF malware analysis — malicious · 9599f27efb03de5a

MALICIOUS

PDF

9.7 KB Created: 2008-07-26 19:43:58 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: b4aed0df2e366e04d72d7afc283a5032 SHA-1: a75f0a7d55d9072e6250ebb2a64c1231acbb284b SHA-256: 9599f27efb03de5a61f8b315bc5bc84c917acb19d30d41c35266450d14afb720

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript with multiple eval() calls, indicating obfuscated code execution. The ML classifier strongly flags this PDF as malicious. The extracted JavaScript file, javascript_obj0013_000.js, is the primary artifact. The script's intent is to download and execute a second-stage payload, as suggested by the heuristic firings for PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The confidence is slightly reduced due to the lack of specific IOCs like URLs or hashes within the provided evidence.

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_000.js` `8fae8c1f40984750c5b5cf28533286b3b0b75db391c0b85461bfa3c317726f21`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	8387 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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