PDF malware analysis — malicious · ed950b2906306ba6

MALICIOUS

PDF

11.1 KB Authoring application: Twixt either to lord chesterfields letters of thousands of honor made

MD5: e0052e2532ed37d6330c472aaf4b7511 SHA-1: 338f62cbcbe797c77d8af7c9b10dfc59760e4b6b SHA-256: ed950b2906306ba6b41cd6ba7613f15941e22fe1479f8cd2bb6eea29a4c9dd1b

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by multiple heuristics including ML classification. The JavaScript stream is obfuscated using `unescape()` and `String.fromCharCode()`, indicating malicious intent to hide its functionality. The primary function of this script appears to be downloading and executing a secondary payload, as suggested by the obfuscation techniques and the presence of a suspicious extracted JavaScript file. The ML classifier's high confidence score further supports the malicious nature of this PDF.

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` `ae6191cf44a6fad8055f41c21f730308b1b4cccbcbf3a94039d6ad8531b2bd92`	pdf-javascript-stream	PDF /JS object 18 at offset 0x4BA	163227 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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