PDF malware analysis — malicious · 9f4de405f6db842c

MALICIOUS

PDF

8.2 KB

MD5: 0e432ceef87fd400fcad2eae5d6eb89b SHA-1: 2a478c2b428e1dc2aba46fc95ebdb2c09c69e52f SHA-256: 9f4de405f6db842c878109bf1c3ccc548e32ae0378a2124a710b0baa45aed356

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream exhibits obfuscation and uses eval() and String.fromCharCode(), indicating an attempt to hide malicious code. The ML classifier strongly suggests maliciousness. The primary function of the embedded script appears to be downloading and executing a secondary payload, as indicated by the ML_NYX_PDF_MALICIOUS heuristic and the presence of an extracted JavaScript file. The exact URL or execution details are obscured by the 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. (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_obj0013_001.js` `7ee409ab598c4a766eb6d1c5ab9d0f26abb38a0a0de48f5abcf74615b80eafc9`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	14698 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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