PDF malware analysis — malicious · c43be8c2fd9f2b8f

MALICIOUS

PDF

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

MD5: 0b1a386174e32b299b2c19b160c1e570 SHA-1: a8e0ac0681ed1182af5c67645b2bb3d98e087252 SHA-256: c43be8c2fd9f2b8f7b0abe2a13e8db58a174b7afc2fc7fd1290686d0092c5c21

346 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1071.001 Web Protocols

The PDF file contains embedded JavaScript that is triggered by the OpenAction. Heuristics indicate the use of eval(), String.fromCharCode(), and specific CVE exploits (CVE-2007-5659 and CVE-2008-2992), suggesting the script is designed to deobfuscate and execute malicious code. This code likely downloads and runs a secondary payload, as indicated by ClamAV detections on extracted artifacts. The file is identified as Win.Trojan.Agent-36167.

Heuristics 10

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)
util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
ClamAV: Win.Trojan.Agent-36167 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-36167
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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` `7f06ab788843bf9479d2ce55e833990c253088bb1de457cbf9ecb81d6588f845`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D7	11174 bytes
Detection ClamAV: Win.Trojan.Agent-36167 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `54aab3755ff7ed94d25a209430ed44220584dd90ed0d47765ebcb9df9e250d91`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x43B	3240 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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