PDF malware analysis — malicious · 0bfd3ec09e76bc2e

MALICIOUS

PDF

5.4 KB

MD5: 3cca57c209ac4de3d0e649f181f755cd SHA-1: f3e3f0c2694e70019deec6b2d91d6259684045af SHA-256: 0bfd3ec09e76bc2e5dd6a5a18ce161f1b114b42c1255c98e0c06c79e08263d80

248 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains obfuscated JavaScript that utilizes the unescape function, a common indicator of exploit code. This script is designed to download and execute a secondary payload, as suggested by the 'PDF JavaScript exploit cluster' heuristic and the presence of an embedded JavaScript file. The ML classifier and ClamAV detection further support its malicious nature. The exact URL or payload is not directly visible due to obfuscation, but the intent is clear.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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` `9f9a5726733568afd09061feae9ca8e7b5f5dfd2b67b358ad4e10d0dd0bd5035`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	3611 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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