PDF malware analysis — malicious · e91bfed836c64c7f

MALICIOUS

PDF

8.4 KB Created: 2009-06-24 17:28:12 Authoring application: dWyPlhdVNexTKAZ (via xALTdwLZkagGGaY)

MD5: 00964d5d1d406386e8be3e4dcd4df42c SHA-1: 9dea696833f9a273281421d9405f4d364f704470 SHA-256: e91bfed836c64c7f41faf4ca1fe605906e4b49a451b5330476cae692a0089420

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript streams, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE suggests obfuscated JavaScript code designed to execute arbitrary commands. The ML classifier strongly flags this PDF as malicious. The extracted JavaScript files, javascript_obj0007_000.js and javascript_obj0007_001.js, are likely responsible for downloading and executing a second-stage payload, although their specific actions are obscured by obfuscation.

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.
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_obj0007_000.js` `891d6e90172563a3348d5ae4c537f9aee0c37e8aa8a53b96a1b5aaea36b7988e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x34D	5763 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `7842865a6ca46c6169141e3a187315f4cb57632c2f3b380825f23f052569cfba`	pdf-javascript-stream	PDF /JS object 7 at offset 0x34D	2361 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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