PDF malware analysis — malicious · 092188cdf789603d

MALICIOUS

PDF

2.9 KB

MD5: d9fdaacddfa345f33a3508e19dfbf203 SHA-1: 3a5ac205fd27d762a19ead959e4b3343a3bec47a SHA-256: 092188cdf789603db800a64b1287c122a5074b3740f9a8f8bf8ef3ea77c8bf52

208 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 technique for exploiting PDF vulnerabilities. The script is designed to download and execute a second-stage payload, as indicated by the ML classifier and ClamAV detection. The primary IOC is the embedded JavaScript file itself, which is the vehicle for the exploit.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 6

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_obj0006_000.js` `61d10200e536975640391f8ef7eb7c4173c736745b179eb90fec709209788355`	pdf-javascript-stream	PDF /JS object 6 at offset 0x1B6	1732 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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