PDF malware analysis — malicious · bf3acdeab9b8a35f

MALICIOUS

PDF

3.1 KB Created: 2009-05-31 15:33:12 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 20b34cfa125ef257d0a8cfb4284dd8f6 SHA-1: 3d9bd0d381584ea3590582c29599e659dd5f9898 SHA-256: bf3acdeab9b8a35fad98fedac9cffd12e0e7733747d51b6660bfaa5b3a44a53a

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The ML classifier strongly flagged this PDF as malicious. The presence of 'eval()' and 'String.fromCharCode' suggests obfuscated JavaScript code is being used to likely download and execute a secondary payload. The deobfuscated JavaScript file is also present, further supporting this.

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` `414e4c76f02ad86c93ad2bf110e35e4ca4cad865d4f1b19977a105e70d02ffd9`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	4773 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` `d570eece685cc781ad29bc4acaacaf8ab5a522383275ffc99b848f55762ab6d4`	deobfuscated-js	PDF JavaScript deobfuscation pass	12007 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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