PDF malware analysis — malicious · 63b22e7244e4b8c3

MALICIOUS

PDF

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

MD5: 1cfc22d7d3d6b9d9ac3f768024a3dd0d SHA-1: d12a861620cca77f64639a64f79461142ecf992f SHA-256: 63b22e7244e4b8c31ae64374ddcad62d9c3e5f9bf044eb929335223d446121f2

114 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 is heavily obfuscated. Heuristics indicate this JavaScript is likely an exploit attempting to execute arbitrary code. The script's obfuscation and use of `String.fromCharCode` (via `xno(obvg)`) suggest it is designed to download and execute a second-stage payload, a common technique for malware delivery.

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` `e746e7645bcc2ad567cb072becbb905c19ff4e0c36712fd0438cc7c1726cce41`	pdf-javascript-stream	PDF /JS object 1 at offset 0x61B3	362 bytes

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