PDF malware analysis — malicious · 454b95057a69b295

MALICIOUS

PDF

2.7 KB

MD5: d7c593e089a0a78f34e8c333ecfd9d31 SHA-1: 56c858203c2aaa95b63bc21e18874df374f24561 SHA-256: 454b95057a69b2953dd575501eba59734833fd28d39b4d82abab697fc4cfbcb2

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The presence of PDF_EVAL and PDF_FROMCHARCODE suggests obfuscated JavaScript code is being used to execute malicious actions. The ML classifier strongly flags this PDF as malicious. The extracted JavaScript files, 'javascript_obj111611_000.js' and 'javascript_obj111612_001.js', are likely responsible for the malicious payload delivery.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `99a75e339aab2e225fc2d2cc785f60d7ed458e898b78cc4df7700b8c867890ca`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `75c2795e84401703d1410b4168f9e05c07a87e4d56095bfce5934ac04f65a75a`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x268	3321 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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