PDF malware analysis — malicious · 6d5d1f94e2606d11

MALICIOUS

PDF

9.6 KB Created: 2013-03-29 14:46:35 Authoring application: NqClB2h4 (via SuGyPYJ)

MD5: 497496406b5486fcef5ecef58daa1850 SHA-1: 6b6d55d1e4d7601bbed5954147a68a991d021315 SHA-256: 6d5d1f94e2606d116472c8bd5e004d7c73ca352fcf8c18ab4f0526da2ed05010

148 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that is heavily obfuscated and utilizes an eval() call, indicating malicious intent. The ML classifier also flagged this PDF as malicious with high confidence. The script's obfuscation and use of eval() strongly suggest it's designed to download and execute a secondary payload, a common technique for malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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_obj0007_000.js` `81fa2931f1321f1e8e2f38ae9c2d06ed9cda121d3ddb996b3f618fcff3ade6e7`	pdf-javascript-stream	PDF /JS object 7 at offset 0x248	8328 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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