PDF malware analysis — malicious · 9bbea2350307b05a

MALICIOUS

PDF

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

MD5: e17d4af65c5497893879e2720e20f319 SHA-1: 874fe3da17f388c0f75d53d1c37480037cf6febf SHA-256: 9bbea2350307b05aacb8bc26e683d74b80dff470a2a4fae670bea33e2ec11053

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file was flagged as malicious by a ClamAV signature (Pdf.Exploit.Agent-36118) and an ML classifier. It contains embedded JavaScript with multiple obfuscation layers, including the use of eval() and string concatenation. The script's intent appears to be downloading and executing a second-stage payload, as indicated by the heuristic firings for PDF JavaScript actions and eval() calls. The specific JavaScript code reconstructs strings like 'Math.max' and 'charCodeAt', suggesting dynamic code execution.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Exploit.Agent-36118 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36118
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` `ba6d6fd9d191213999a64e234c9ffe1bfd932f5233fa0528bc82adaf26a49592`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	13275 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 13 long base64-like blob(s).

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