PDF malware analysis — malicious · b1b9d77bb4a5d746

MALICIOUS

PDF

2.9 KB Created: 2008-08-06 01:42:27 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: c6b56c38b597f95bc8fe3f6778775c62 SHA-1: 9281852bbb874e5a431ea278470a3c18e96d45ff SHA-256: b1b9d77bb4a5d746e272a0cd1a69df5e9ee82f00347a2949bdc40df4a09a049a

128 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 high confidence. Static analysis revealed embedded JavaScript streams containing eval() and unescape() calls, indicating obfuscation. The presence of these indicators suggests the script is designed to download and execute a secondary payload. No specific family could be identified due to the obfuscation.

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)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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` `9db7a0c7de154bc667d3f062e190127fc42d8f8a4a1da660a94d702471dca423`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36A	4098 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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