PDF malware analysis — malicious · 0789119ffe2c209c

MALICIOUS

PDF

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

MD5: 4d32a412b1d29bc276a201c739e71ccd SHA-1: 5f25b7f2b38bae124b1bc7a28414298060b9075e SHA-256: 0789119ffe2c209c264ec7f3b297c3f7a95d3bbfcc5d94bd358625eff22dcf1e

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 utilizes String.fromCharCode and obfuscation techniques to execute malicious code. The script appears to download and execute a second-stage payload, indicated by the critical heuristic firing for PDF JavaScript exploit cluster. The ML classifier strongly flags this PDF as malicious.

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` `57a975690991f8e517456b1fbbe3ff16dfcbb377804adfaabb4aa8fcd0e1f66d`	pdf-javascript-stream	PDF /JS object 1 at offset 0x4650	353 bytes

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