PDF malware analysis — malicious · 6d6051ee21621707

MALICIOUS

PDF

4.7 KB

MD5: 40d695fee3e617b64a9eb0c56fabad41 SHA-1: 47c46b922f82cdf8df6c30bdac78e52799306b19 SHA-256: 6d6051ee216217073b5b31bb5c5483f1d2c37899e38b75facffbcf4fa63852e4

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, indicated by the use of `unescape()` and complex string manipulation. This script is designed to exploit a known PDF vulnerability, likely to download and execute a secondary payload. The presence of `PDF_JS_EXPLOIT_CLUSTER` and `PDF_U3D_CVE_RELATED` heuristics further supports this conclusion. The primary IOC is the obfuscated JavaScript payload itself.

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` `50fd8fae4eaa962f3e644bc64e86c7860ccc4b22749a6e89594a31922e79e7f1`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	2904 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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