PDF malware analysis — malicious · 364db1368293eb7e

MALICIOUS

PDF

10.8 KB Authoring application: .a

MD5: d5e54eb45bb85b377495115ec42b8d8e SHA-1: 55575f3e4e85d365d7ead55b454f22d5ee317ad0 SHA-256: 364db1368293eb7e994aa7309d9821ad2b7c13da2904a158185e10731b27b3de

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded, obfuscated JavaScript. Heuristics indicate the use of unescape() and String.fromCharCode, common techniques for hiding malicious code. The ML classifier strongly flags this PDF as malicious. The primary function of the embedded JavaScript appears to be downloading and executing a second-stage payload, as suggested by the 'Suspicious extracted artifact' heuristic. The document body is unreadable binary data, providing no contextual clues.

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` `1873a417be887ea5cf9a241ce1d245185ee7873d9c9314cc7fc8720bab741d85`	pdf-javascript-stream	PDF /JS object 18 at offset 0x4BA	162942 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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