PDF malware analysis — malicious · 430ffcfb08359892

MALICIOUS

PDF

75.9 KB Created: 2010-03-17 11:18:58 Authoring application: Gbd59u (via CQYlxj9)

MD5: f2d99406149f4f3938fef29a32e88f07 SHA-1: 436bdd6c43e7cb00ec133935d4ab6ac8f50570ec SHA-256: 430ffcfb0835989208d9fb5610cb6bad048536c810c936d0790ebe72dbd0f158

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded 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 stream, named 'javascript_obj0007_000.js', is highly obfuscated and uses `eval()` and `String.fromCharCode()`, suggesting it's designed to download and execute a second-stage payload. The exact nature of the payload cannot be determined due to obfuscation, but the techniques used are consistent with malicious PDF delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.
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_obj0007_000.js` `42a0640ac672361b27f527611c3453d98452d51965e74f4018552810dfef498a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23D	76556 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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