PDF malware analysis — malicious · 50b34eb6697e1b53

MALICIOUS

PDF

6.7 KB Created: 2009-11-17 23:22:12 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: f8ae42ed2c890d64a90eb277c5366fc3 SHA-1: 0f7126a16448b6c84607c6a579001a568b0a6874 SHA-256: 50b34eb6697e1b53666146243609e68d933ecda6bef72ace854ac831a302b645

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. Heuristics indicate the use of JavaScript obfuscation techniques such as unescape() and String.fromCharCode(), suggesting the script is designed to hide its malicious intent. The primary function of the embedded JavaScript appears to be downloading and executing a second-stage payload, as indicated by the obfuscated nature and the presence of an embedded JavaScript stream. The extracted artifact 'javascript_obj0016_001.js' is also suspicious.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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_obj0016_001.js` `b8b9f49f385526b35b2770c51e6ac28ec1be4baab171a34d3296c7f23b06ca4c`	pdf-javascript-stream	PDF /JS object 16 at offset 0xC9A	12549 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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