PDF malware analysis — malicious · 82dfbf7fe357039e

MALICIOUS

PDF

17.7 KB Created: 2009-02-24 10:27:15 Authoring application: A4rybY6jaoQkjK (via GWA3aKbX9BE6E)

MD5: 17e30ae99756dbde02be833a30219140 SHA-1: 95f981809b633532b8e0af81c4b4108deaad8b20 SHA-256: 82dfbf7fe357039ef38761b48b1ffdee6e4732d5de91b4d28737ced48da45889

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flagged this PDF as malicious. The JavaScript stream, identified as javascript_obj0007_000.js, likely contains obfuscated code, as suggested by the PDF_FROMCHARCODE and PDF_EVAL firings. This script is designed to execute malicious code, potentially downloading a second-stage payload or performing other malicious actions.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `febb338abdd779cb81738e1fb8061e29e20eaaef299d3883a2ca087d3be1afa6`	pdf-javascript-stream	PDF /JS object 7 at offset 0x243	16833 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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