PDF malware analysis — malicious · df685a46926a66ee

MALICIOUS

PDF

3.5 KB Created: 2009-02-12 14:08:19 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 9b08a0498611f4229f369faf635bcb9e SHA-1: e8c04e5569603c4df22811c825b276be18cfddbb SHA-256: df685a46926a66ee6481248c94306fe47b3046a35c3372f93ab26e66f6936d92

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file was flagged as malicious by an ML classifier with high confidence. Static analysis revealed embedded JavaScript streams, including one that uses eval() and String.fromCharCode, indicating obfuscated code execution. The presence of deobfuscated.js suggests a complex script designed to download and execute further stages. The primary attack pattern involves leveraging PDF's JavaScript capabilities for malicious code delivery.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `b87b8feeaa7b99e1bcc6b086d2ed36daee75936496d95b490a540a0888df0867`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	7170 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `390b4288fa931815ac1458d91d951faaedb7983cc7e73a7359d38cdb8ce59293`	deobfuscated-js	PDF JavaScript deobfuscation pass	14738 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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