PDF malware analysis — malicious · 6752c734eb97ec22

MALICIOUS

PDF

32.5 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: 1912e6652a5142cd1f83cac0423b1a06 SHA-1: c5ce972627f2218d07186623b49a85755097b270 SHA-256: 6752c734eb97ec22350a7ae350a298ddf8e685a5232edb314906b270e2cf123c

114 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 is obfuscated but appears to be designed to exploit a vulnerability. The script attempts to construct and execute a payload, likely downloading a second-stage malicious file. The ML classifier strongly indicates maliciousness, and the presence of JavaScript exploits in PDFs points to a common attack vector.

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.
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `6bede569415e64ce8b2fa8ab51ca5b19345d02e08ae3cf34c56aefc8ea5a9986`	pdf-javascript-stream	PDF /JS object 1 at offset 0x7FAD	376 bytes

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