PDF malware analysis — malicious · 2c4dbe682177b639

MALICIOUS

PDF

26.1 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: dfe6c32268ab764c43c77ea12be54401 SHA-1: 36086e1c0bac082d3cbb815a42dd73a3a4d2ce40 SHA-256: 2c4dbe682177b639f8c3e3c9270d4c6fe7b395257c09167176632c0838a5804c

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

This PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The presence of a high-severity PDF_EVAL heuristic indicates the use of eval(), a common technique for obfuscating and executing malicious JavaScript. The ML classifier strongly suggests malicious intent. The JavaScript is likely responsible for downloading and executing a second-stage payload, as indicated by the ML_NYX_PDF_MALICIOUS firing and the general nature of such embedded scripts.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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.
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_obj0001_000.js` `6e7bcdd6cb2a7dc439bfbe8122ab9774de6126b35d698c7d3fd4e6da02598d52`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	910 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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