PDF malware analysis — malicious · a91daf5585547a5e

MALICIOUS

PDF

4.0 KB

MD5: ee64a09021317b8239c106e22703b4fa SHA-1: 848807f5901a1975d1b7e04a48bfb2f0a66f83b4 SHA-256: a91daf5585547a5ec62a92188789afb20f201df09346f336eb1b494b17c51cd0

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a PDF_EVAL heuristic firing suggests the execution of obfuscated JavaScript code, likely to download and execute a second-stage payload. The ML classifier strongly flagged this PDF as malicious. While the exact functionality is obscured by obfuscation, the techniques used point towards a common PDF-based malware delivery mechanism.

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. (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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `acfb86cef53ea4f6fe166fcc021448a7ce8991f4fae289ad59736358177e3bfc`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `b6fd329d2ca8d58c20db3e76b7bd2af72fa91aa6aea4f4504bc0a71b43fe11bc`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	5581 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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