PDF malware analysis — malicious · a3e41c615a34b683

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: 81f06a47472982eec47a01f61abc9e4b SHA-1: f104b23a2a65a326f23f0499e8ec4859b253e6fe SHA-256: a3e41c615a34b683c1a088b7dc96a7b9a366f32145aa50340928671ad1c1da45

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell T1204.001 Malicious Link/URL T1059.003 Windows Command Shell

The PDF file contains embedded JavaScript that is triggered by the OpenAction feature. The critical heuristic firing indicates the use of CVE-2007-5659 (Collab.collectEmailInfo), which is a known vulnerability in Adobe Reader. The JavaScript is obfuscated using `String.fromCharCode` and `eval()` and is likely designed to download and execute a second-stage payload. No specific malware family could be identified.

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` `0d875d355f08794f755e5518a584dd3a6d603a7a3ea45f90fc38565b36cce42c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D7	13289 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` `661b8034114382c57d10a7df40bf6844fb704a903631457f11da18a54761c492`	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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