PDF malware analysis — malicious · b8d41dd2137eb09d

MALICIOUS

PDF

5.1 KB Created: 2008-08-06 01:42:27 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 3f3587c6538f15ab516e856b4194b19a SHA-1: 1968b480a6802a8bc34fe99f8bcda46be0ce8a6b SHA-256: b8d41dd2137eb09dc4249f9acd146ee5d6dfff8436c1d725afd76e65a7de5987

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript streams, with one stream exhibiting eval() calls and String.fromCharCode usage, indicative of obfuscation. The heuristics suggest the JavaScript is designed to execute malicious code, likely downloading a second-stage payload. The presence of obfuscated JavaScript and the 'malicious' verdict strongly suggest this pattern.

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_001.js` `2a0e0cf33327106222b95aa8ffbaa08a408ac19ae64361771f2651f415fbce80`	pdf-javascript-stream	PDF /JS object 13 at offset 0x363	6783 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `ad0915b2b9da021a75a4bec6cc6851aa4a86ef36c2c276d3f7559e64a3b1abf8`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x719	4412 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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