PDF malware analysis — malicious · 5ec6b923bf6b76c3

MALICIOUS

PDF

31.7 KB

MD5: 76dd8c1ff99d5ff9d11201e8ff8f6c98 SHA-1: a08cee1dcf69939c2931dd60226542d4ca091a7e SHA-256: 5ec6b923bf6b76c34551164c662d2addadf653a30395ec599e47e2ba737470c6

146 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, a common technique for obfuscating malicious code. This JavaScript is highly likely to be responsible for exploiting a vulnerability within the PDF reader to download and execute a secondary payload. The ML classifier strongly indicates maliciousness, and the critical heuristic for a JavaScript exploit cluster further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0032_000.js` `bdc914059d05c111758882ed18492477c0b79fb0b6355b5fdd82bc36fb4779fa`	pdf-javascript-stream	PDF /JS object 32 at offset 0x2CA	2886116 bytes

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