PDF malware analysis — malicious · f1db79250316ba61

MALICIOUS

PDF

3.5 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: b57d231260ea866ca1727ef447c48edf SHA-1: eb265d4e2060cc9079bad81f26032404e2be44ec SHA-256: f1db79250316ba613524d84f46e4c4f57187f11667827726f728db4351ac1845

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Scripting: JavaScript T1204.001 Malicious Execution: Malicious Link T1204.002 Malicious Execution: Malicious File

The PDF file contains embedded JavaScript that is triggered by the OpenAction. The critical CVE-2007-5659 heuristic indicates the use of `Collab.collectEmailInfo` to decode and evaluate JavaScript. This JavaScript is likely designed to download and execute a second-stage payload, exploiting a known vulnerability in older PDF readers. The obfuscated nature of the script and the use of `eval()` and `String.fromCharCode` further support this conclusion.

Heuristics 7

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
OpenAction trigger high PDF_OPENACTION

PDF has an /OpenAction — code runs automatically when opened
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` `8bd4c0e34766a499f38797603951ae97c3e32da73627fcc1e4dabb8f0fff7631`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D7	13505 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `d6920d8f1e4e5dedf8900939d6067dae64581136dfd21956bfafcafbb09212c7`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x445	4032 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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