PDF malware analysis — malicious · ac86f4b256b45fbb

MALICIOUS

PDF

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

MD5: b65ee9b578b6e7699d6bb0aef51c63e7 SHA-1: 7b49e115c1b32fef6d967fbd8d5bf13a12c1a355 SHA-256: ac86f4b256b45fbb87ac4e0c05a20ad2208c879cee5e79f4432de52cec9079cc

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF sample contains embedded JavaScript that utilizes eval() multiple times, indicating a deobfuscation routine. The ML classifier and ClamAV detection strongly suggest malicious intent, likely an exploit targeting PDF viewers. The script's primary function appears to be executing further obfuscated code, which is a common technique for downloading and running second-stage payloads.

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` `ac3a66218f905c33b2334ab0b10c69bf01594f53b443239134780859a0599925`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	13478 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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