PDF malware analysis — malicious · a53f3821aa728d29

MALICIOUS

PDF

2.6 KB Created: 2010-13-41 24:22:00 Authoring application: Neon PDFLib 166.50.167

MD5: 3ca9b23263db041eb83ef4a8fe3c2b2f SHA-1: 3c6f01d8ad7afffc867e360208447de36e387c5d SHA-256: a53f3821aa728d29937a78b9838ceffaebda1d74b63aca62644da7b4b5efb150

176 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell T1059.007 JavaScript

The PDF file contains embedded JavaScript and triggers an OpenAction, indicating it's designed to execute code upon opening. The critical CVE-2008-2992 heuristic firing, specifically mentioning util.printf, strongly suggests exploitation of this known PDF vulnerability. The presence of a suspicious JavaScript file further supports the malicious intent. The script likely downloads and executes a secondary payload, although the exact mechanism is obscured.

Heuristics 6

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)
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)
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `8e7bca566af6d4aa893bff173de07217e64a1caef49f4b66e83343591e98061e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	3045 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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