PDF malware analysis — malicious · 3f8c76ecaf8df337

MALICIOUS

PDF

3.5 KB Created: 2009-02-24 03:45:50 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 5e07f21af0176bf5620bbdbdba3b8c70 SHA-1: 8b606cd70d9e9b6549c0f470e8942f6ba7079048 SHA-256: 3f8c76ecaf8df33760e8e1596ba798e7ef0d092eb769e00a88e26a0d7d44fd17

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The 'deobfuscated.js' artifact suggests that the embedded script is heavily obfuscated, a common technique for hiding malicious payloads. The script likely attempts to download and execute a second-stage payload, as suggested by the 'eval()' call and 'String.fromCharCode' usage. The presence of these indicators points to a malicious PDF designed for payload delivery.

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` `9fbae55e82d0acebca669f75a36365b77700ca252a4737844e01c29e23fefeb0`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	7169 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` `748e62d9dc6214bcf2aa3998fb5ea8e00463ac0a5a1211e02cce45b09d926b52`	deobfuscated-js	PDF JavaScript deobfuscation pass	15687 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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