PDF malware analysis — malicious · 9e6c201af3cbe621

MALICIOUS

PDF

11.1 KB Authoring application: Our time had gone from.

MD5: 278a991fd861ff7a6570c3ddc9d44416 SHA-1: 0c8702c309c8e49b00c7d254579ad9d58bf42008 SHA-256: 9e6c201af3cbe621a2bfebd84fbea777ca663ac660ef64f0434609e60bc3c023

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream is obfuscated using unescape() and String.fromCharCode, indicating an attempt to hide malicious code. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the heuristic firings and the presence of an extracted JavaScript file. The document body text is largely unreadable and does not provide further context.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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_obj0018_000.js` `30665ed344dabf325940b20b2092ad48bd3aaa90e76a3d57f8e2e403d8355e53`	pdf-javascript-stream	PDF /JS object 18 at offset 0x4BA	163439 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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