PDF malware analysis — malicious · 12fd295bb34c804c

MALICIOUS

PDF

14.5 KB

MD5: 9d1036b08f16ad7ad270cae3839e6eaf SHA-1: df1c5b655aa5d84554f3eabf6d4748a8bd6e9474 SHA-256: 12fd295bb34c804c619ebc54c45e722ef17960bf71479b5a9d1fc12c369552c8

208 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and U3D content, triggering high severity heuristics related to CVE-family exploits and ML-based detection. The embedded JavaScript, specifically the `javascript_obj0010_001.js` stream, appears to be obfuscated shellcode designed to exploit a vulnerability, likely for client execution. The ClamAV detection of 'Js.Exploit.Shellcode-18' further confirms the malicious nature and the presence of exploit code.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
ClamAV: Js.Exploit.Shellcode-18 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Js.Exploit.Shellcode-18
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.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `90c70853178b4dfbe5aeb450bc9c83613bf38a945de76ebe1faf0f9fd5312150`	pdf-javascript-stream	PDF /JS object 5 at offset 0x111	62 bytes
`javascript_obj0010_001.js` `b48be05ef756aa0c3c2dbe57ae005ec7a6740490e7223c948d44c1200c9957e4`	pdf-javascript-stream	PDF /JS object 10 at offset 0x512	4096 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`u3d_00_off000001f5.bin` `5517083ed4e64eadc460f36ee7cf3c54a0fc2bd0fccac15f3b3d4e231c069f96`	pdf-3d-stream	PDF U3D 3D stream at offset 0x1F5	343 bytes

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