PDF malware analysis — malicious · 66bc224e09d14435

MALICIOUS

PDF

4.2 KB

MD5: af84e5d2825d9f7f87ce159933f768ae SHA-1: 6cf75ceaf402211365c9a8338fc4bdeeef9eb78d SHA-256: 66bc224e09d144350ef4bcba3c7a594d2b2c28a471a3725b44bee55c6f7ad22b

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. The script appears to be designed to download and execute a secondary payload, as suggested by the PDF_JS_EXPLOIT_CLUSTER and PDF_UNESCAPE heuristics. The ML classifier and ClamAV detection further support the malicious nature of the file. The specific exploit and final payload remain unknown due to the obfuscation and truncation of the script.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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` `08a1c555d6d6266bd155c3e43d645fa7c225c5d1f5253e25f603b65c33ab950d`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	2306 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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