PDF malware analysis — malicious · b0f4a5a52c3b79e5

MALICIOUS

PDF

3.2 KB Created: 2008-10-13 22:20:38 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 4f79598e1fde6636c77b4c572a3458c2 SHA-1: 2905dcb6554c9fad41b1d3b8706ef0c2b90cc9f9 SHA-256: b0f4a5a52c3b79e5689e7231a43c6ad01202259a1ed19ee19bae1c28bbb86b5d

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of eval() and String.fromCharCode() suggests the script is obfuscated and likely designed to download and execute a secondary payload. No specific family could be identified, and the primary IOCs are the JavaScript execution methods themselves.

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` `d4b3d6603502568acb33f0088c69a2499ad5dabfc472af6e869f6fa6c4771960`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	5484 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` `0c7bb8843c928f813ca61d1a3d5701cd6eb2d82647edcf5c2a70fac3ea0f4da1`	deobfuscated-js	PDF JavaScript deobfuscation pass	11611 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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