PDF malware analysis — malicious · ffda21fe812701df

MALICIOUS

PDF

3.6 KB Created: 2008-12-17 23:30:58 UTC

MD5: 2ea56953e4a9aba6db116ff57ee3a7ad SHA-1: a4f12f789fd2471d8c832ab9482bfb0b04f196d2 SHA-256: ffda21fe812701df926cba1071c2433003eda3ddda42d232df8f3f1c50460d2d

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly flagged this PDF as malicious. The JavaScript stream, identified as javascript_obj0006_000.js, likely contains obfuscated code that uses eval() and String.fromCharCode to execute malicious actions, such as downloading and running a second-stage payload. The specific intent of the script could not be fully determined due to obfuscation, leading to a slightly reduced confidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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_obj0006_000.js` `cedfa16f26ae5fd6359e353fd5c467e70c2ec280af2d3b3a7d29a4eb586a7826`	pdf-javascript-stream	PDF /JS object 6 at offset 0xB5	9539 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 7 long base64-like blob(s).

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