PDF malware analysis — malicious · 8199f57b7fdb051a

MALICIOUS

PDF

8.8 KB Created: 2009-06-13 18:09:28 Authoring application: oNEzhdcnxoJcdpZIpKO (via kcLoVpYfFRDeYbeEy)

MD5: 21f00cce32c8153fb70be1cc6398af54 SHA-1: d17843afca7666a8876ad92cf4370fe8d5675060 SHA-256: 8199f57b7fdb051aa5adb285177bf688c87409a70b0f63442938fb1710bcb546

176 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a PDF containing obfuscated JavaScript, flagged by multiple heuristics as malicious and specifically identified as a PDF exploit. The embedded JavaScript, when deobfuscated, constructs a URL from various encoded parts and likely downloads a secondary payload. This is a common pattern for PDF-based malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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: Pdf.Exploit.Agent-35572 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35572
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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_obj0007_000.js` `97ce8316622aa28df1effe105d298195d946c39784a83ce49babb5e7525f9c8f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x40A	7239 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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