PDF malware analysis — malicious · ff201072e4920ce1

MALICIOUS

PDF

3.2 KB Created: 2008-07-28 19:49:23 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 10da58808e083c9ababff340603db08c SHA-1: 8535bc15c10355fd3e07416b232e6af3e14a7442 SHA-256: ff201072e4920ce168e90ae5bace3639b942f7950c5c5386952617f2a9d97dab

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, with heuristics indicating the use of eval() and String.fromCharCode, suggesting obfuscated code execution. The ML classifier strongly flags this PDF as malicious. The presence of deobfuscated JavaScript further supports the analysis that the script is designed to download and execute a secondary payload. The exact nature of the payload and its destination could not be determined due to the obfuscation.

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_obj0013_000.js` `0c04c94076ad0d9d36f851cf501132bea9bf9ba43f13459859e9e6211432f01b`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	5466 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `f344fd365c74387f123eb8a7efeaf5b48e9dcf65e2788490e5c478727439a77e`	deobfuscated-js	PDF JavaScript deobfuscation pass	11970 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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