PDF malware analysis — malicious · 8141cff916bf2a49

MALICIOUS

PDF

25.8 KB Created: 2006-02-01 14:14:12 Authoring application: Wegoptyr (via HghTc6Fs)

MD5: b6787b0d62c3d8bc6a544d99b6e09189 SHA-1: e7d3cbc998370a4fe8ceaedffc685fac645c8855 SHA-256: 8141cff916bf2a491b5443134257f35c3322a9ed658313da5ff5f7df541790a3

208 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript that utilizes an eval() call, a common technique for obfuscating malicious code. The ClamAV detection name 'Pdf.Dropper.Agent-7277391-0' and the ML classifier output strongly indicate malicious intent. The JavaScript is designed to download and execute a second-stage payload, characteristic of a dropper malware.

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.Dropper.Agent-7277391-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7277391-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `85a87ed5a37b485d49f23a2438bf33f2d0eb51cf87b492676d2b7b06ec0459ce`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1EE	25330 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `9ee31e0b6c5daabaec39851864a17fc08728902a9c9d173414104ec54bbe692c`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1EE	25058 bytes

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