PDF malware analysis — malicious · 23f96cd247c27b30

MALICIOUS

PDF

1.8 KB

MD5: 5ff8f4dd88e215a84601d65d6aa6c8fd SHA-1: aaba6e9a510167e29d616bb2a46b3a66fb1bd04a SHA-256: 23f96cd247c27b306fed398a36f5b2e87acfe52819b03b1de8db0e45f57801b2

194 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains JavaScript that leverages the util.printf function, indicating an exploit for CVE-2008-2992. The JavaScript code appears to be obfuscated but ultimately constructs a URL and likely downloads a second-stage executable. The ClamAV detection and ML classifier further confirm the malicious nature of the file.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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)
ClamAV: Pdf.Exploit.Agent-36183 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36183
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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.
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `f86b1e5220183f7c7e3ea8cddca0c8beed42f4aca8952f8c95b07b9823f2ed6e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x138	1345 bytes

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