PDF malware analysis — malicious · c9ae3e21b1d1c5e4

MALICIOUS

PDF

11.3 KB Authoring application: Scribus 1.4.5.1 (via Scribus PDF Library 1.5.3.1)

MD5: 09b6fe36cec138e0aa90a358c7c79eb4 SHA-1: 09ece8e33025c89b9e77fb94abf3c33efaaf6b50 SHA-256: c9ae3e21b1d1c5e40dae4f19c3e114467720e8f954e6150370cb713aca338397

236 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and a machine learning classifier. High-severity heuristics indicate the presence of obfuscated JavaScript, including eval() and unescape() calls, which are commonly used to decode and execute malicious code. The embedded JavaScript streams, javascript_obj0013_001.js and javascript_obj0013_002.js, are likely responsible for downloading and executing a second-stage payload. The authoring application, Scribus, is not inherently malicious but can be used to create malicious documents.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

ClamAV: Pdf.Dropper.Agent-6307847-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-6307847-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
PDF metadata JavaScript eval stager high PDF_METADATA_EVAL_STAGER

PDF JavaScript reads document metadata fields such as title, subject, or producer, decodes character data with parseInt/String.fromCharCode style helpers, and evals the recovered stage. This is a high-signal exploit-kit staging pattern.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `03c6a51f99ba778af2be91ee47f8d26edbbbde9e30fa9cc27f62c3f45ec5586e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D7	9990 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj0013_002.js` `5ecf5fd8b89c537714c0a721176015ed4178102db040b225fe6b6828756181f6`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3FD	10561 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).

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