PDF malware analysis — malicious · 04e7834f7a42b092

MALICIOUS

PDF

9.6 KB Created: 2013-04-03 21:33:06 Authoring application: eornmNIma (via E492gn0y)

MD5: 37ec21808179f35e724d7e4649128a70 SHA-1: 31fb4b33c87c788ea0d448f01d04c70b1d60cd2a SHA-256: 04e7834f7a42b0923a63fe476621ec16252538cb22aa0b26e8681cd6230c1d46

148 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript that utilizes eval() and appears to be heavily obfuscated. The JavaScript is designed to download and execute a secondary payload, indicated by the PDF_JS_EXPLOIT_CLUSTER and PDF_EVAL heuristic firings. The ML classifier strongly suggests maliciousness. The specific obfuscation and download mechanism are typical of droppers aiming to fetch further malware.

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` `25e851e900eab37fcaf45c28eb820ccb75b1edcdcd4546470002a2dbb9ec367a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x249	8356 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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