PDF malware analysis — malicious · 3b5f956adda5e298

MALICIOUS

PDF

1.8 KB Created: 2010-11-30 42:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: ba33adbe212abf353088fdffaaacaa87 SHA-1: 2a37cb2e02ed9cc9f758a5366eb9f401aff42ae2 SHA-256: 3b5f956adda5e29834d16f3a0e0c64a12aac2f1afa49afeb31adb41630fb2728

278 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript and triggers an OpenAction, indicating an attempt to automatically execute code upon opening. The presence of the CVE-2008-2992 heuristic firing, specifically related to util.printf, confirms the exploitation of this known vulnerability. The embedded JavaScript stream and the extracted javascript_obj0013_001.js file further support the malicious intent, likely to download and execute a second-stage payload.

Heuristics 8

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. (matched in decompressed stream)
ClamAV: Win.Trojan.Agent-36168 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-36168
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
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `2a83758f7fb82d8b0984773a0e18435943e9c11be1e05319d85bac8d740675fd`	pdf-javascript-stream	PDF /JS object 13 at offset 0x363	854 bytes
Detection ClamAV: Win.Trojan.Agent-36168 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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