PDF malware analysis — malicious · 8f456ff94e4a413b

MALICIOUS

PDF

11.1 KB Authoring application: Winning a darkban ship being searched for normal business.

MD5: 3179797579617a1ae807902059417ce3 SHA-1: c1def86880ec32ce7d67a3745c0335ae00b41c0b SHA-256: 8f456ff94e4a413b5c12d2161805bc9571fee0213b0a16b340f4258a01df201c

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flags this PDF as malicious. The JavaScript stream, identified as javascript_obj0018_000.js, is likely responsible for the malicious behavior, potentially downloading and executing a second-stage payload. The document body text appears to be corrupted or irrelevant, providing no direct clues to the lure.

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` `e141f48896b9831fd5116e07de901635ca8e83473f34b203facf8afd657a2cc9`	pdf-javascript-stream	PDF /JS object 18 at offset 0x4BA	162900 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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