PDF malware analysis — malicious · 12d32b132905551f

MALICIOUS

PDF

1.8 KB

MD5: ee5dddda9b81f635ce1bcf760f914c8b SHA-1: e633aa4e3dfc28011dda28fc902d904b3bf4b0e1 SHA-256: 12d32b132905551f8d38ab2aef0ce734b8dc63c40bc55c5b3189f281c6082ee6

194 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that leverages the util.printf function, indicating an exploitation of CVE-2008-2992. The JavaScript code appears to be obfuscated but contains a reconstructed URL 'http://example.com/payload.exe' which is likely used to download a second-stage payload. The ML classifier and ClamAV detection strongly suggest malicious intent.

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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