PDF malware analysis — malicious · 0b73063b05a72682

MALICIOUS

PDF

22.8 KB Created: 2011-72-51 03:25:00

MD5: 2d6cc274e2bd02da72265ce674cb34ba SHA-1: 19bff6ad703657a818372bf26462b6abc0740e7f SHA-256: 0b73063b05a7268257291562abd2e7ad8e70f21a5bdb81bdef95c7112711846c

148 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that utilizes an eval() call to deobfuscate and execute code. This script is designed to download and run a secondary payload, indicated by the 'PDF JavaScript exploit cluster' and 'ML_NYX_PDF_MALICIOUS' heuristics. The reconstructed string 'this.producer.fromCharCode' suggests the script is likely preparing to decode further obfuscated content or construct a URL for payload retrieval.

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_obj0001_000.js` `0b3729413a92edcb3164a5a4f0200e0f4e23cc80830b9945326136b741b23425`	pdf-javascript-stream	PDF /JS object 1 at offset 0x57FA	634 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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