PDF malware analysis — malicious · c79160facfde2c48

MALICIOUS

PDF

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

MD5: 10a56c5cde7833ef1b86b88b4f682bb5 SHA-1: 9613a0add610a1576acebd5c95cd333b99bd6d0b SHA-256: c79160facfde2c48f2b874e5e7a24aa47ce1a00648c23817ecfaa2b2e213fc04

286 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript triggered by the OpenAction, which utilizes the CVE-2008-2992 exploit. This exploit leverages `util.printf` and `String.fromCharCode` to deobfuscate and execute JavaScript. The primary intent appears to be downloading and executing a secondary payload, as indicated by the ClamAV detection of 'Pdf.Exploit.Agent-35384' on both the original PDF and an extracted JavaScript artifact. The specific JavaScript payload is too obfuscated to fully determine its exact actions, but the exploit chain is clear.

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` `c9df80202ea53dfd002b87cf6a0cee8603d67ff273067d9625ee8f246b7d0f9b`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D7	7640 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` `4e56ec34147739febafd32b154112cb27b826d283580364271bbf5543df40616`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x42F	2208 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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