PDF malware analysis — malicious · 393c1a34dd77eef5

MALICIOUS

PDF

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

MD5: b8a1ee431a259e4217caa66ea8cf76d4 SHA-1: d63e97761c455cd6b8771c9a974039bfcd097579 SHA-256: 393c1a34dd77eef5403d981baa0ec9171129fea8cde2d950f03aca3c9549b966

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The presence of PDF_EVAL and PDF_FROMCHARCODE indicates obfuscated JavaScript execution. The ML classifier strongly suggests malicious intent. The embedded JavaScript file, javascript_obj0006_000.js, is the primary artifact, likely responsible for downloading and executing a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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` `4dab2ac8f7c1cd461a2e3d9fbd4c00a9b8d0d8597f0090c3999083de9482918b`	pdf-javascript-stream	PDF /JS object 6 at offset 0xB5	8046 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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