PDF malware analysis — malicious · 6a69a523b534785e

MALICIOUS

PDF

4.6 KB

MD5: 0c3cb9822f6b5e801c70ffd0405e999c SHA-1: aff2719447176e5c54af4c2af0c277e375a16fd9 SHA-256: 6a69a523b534785ef21fcabf1e2bdcd021f1762147acf067120ba2032a493371

248 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that utilizes the unescape function, a common indicator of obfuscation and potential exploit code. Heuristics indicate a PDF JavaScript exploit cluster and a U3D CVE-related vulnerability, suggesting the script is designed to exploit a vulnerability in Adobe Reader's 3D content parser. The script's primary function appears to be downloading and executing a second-stage payload, though the exact URL is obfuscated and truncated.

Machine Learning

Nyx PDF Classifier malicious score 0.9962

Heuristics 7

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.
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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_obj0001_000.js` `4151491f730d74296c96849e4998e69badd847882dc13c4c1d6794892f5b614f`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	2739 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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