PDF malware analysis — malicious · 4594edc056af8453

MALICIOUS

PDF

3.5 KB Created: 2008-08-19 15:53:40 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: ac189b16f923511227423e54497472f6 SHA-1: 7830e515b8f6413188bccb51d0d7942ce6b71e8c SHA-256: 4594edc056af8453614266eec148352fcb09e12329a269d30f39808fa78615f7

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 User Execution: Malicious File

The PDF contains embedded JavaScript, flagged by heuristics for JavaScript actions, embedded JS streams, and eval() calls. The ML classifier strongly indicates maliciousness. The embedded JavaScript file, 'javascript_obj0012_001.js', is likely responsible for executing obfuscated code, potentially leading to further exploitation or payload download. The presence of eval() and String.fromCharCode suggests code intended to be dynamically executed.

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)
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. (matched inside decoded stream)
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_obj0012_001.js` `332034b478b1fd34caa723ce37fc175e31ecba9a5b041077ac7237eec65d55cc`	pdf-javascript-stream	PDF /JS object 12 at offset 0x3C5	5592 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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