PDF malware analysis — malicious · f96ddc28c90b0178

MALICIOUS

PDF

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

MD5: bc0b9984cbc769567a33e93dd053b7f1 SHA-1: 07fc59b1a30e59c4164f75c24bca23d50365fa6e SHA-256: f96ddc28c90b01783f1ff83c0555343e1378af215673eb9ed2c78eb078d18e70

286 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell T1204.002 Malicious File T1059.007 JavaScript

The PDF file contains embedded JavaScript that is triggered by the OpenAction feature, a common technique for exploiting PDF vulnerabilities. Heuristics indicate the use of eval() and String.fromCharCode, along with a critical finding for CVE-2008-2992, suggesting the script is designed to deobfuscate and execute malicious code. The presence of ClamAV detections for 'Pdf.Exploit.Agent-35384' further confirms its malicious nature. The script likely downloads and executes a second-stage payload.

Heuristics 9

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: Pdf.Exploit.Agent-35384 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35384
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` `b0dbf7d97852d96a04ca300dc991d058fbef1109411cfbde2231e5eda8289f9d`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D7	7515 bytes
Detection ClamAV: Pdf.Exploit.Agent-35384 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `9d970bcdd5fcd8f2a6e7780df35143e65bb47717d8b2f0cbd5b88929f82ac680`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x432	2166 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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