PDF malware analysis — malicious · 189d3069e1cada08

MALICIOUS

PDF

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

MD5: 0e795abe1ea499476e0b40dedb01b36f SHA-1: 4cfc4ea6cd51f5993009c74d7568972f15bbb76d SHA-256: 189d3069e1cada083c67247b4250593ceb48d64af2af5320390619bbbf625c87

114 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded JavaScript that utilizes String.fromCharCode and obfuscation techniques to construct and execute a payload. The script appears to download and execute a second-stage payload, as indicated by the critical heuristic firing for a PDF JavaScript exploit cluster. The ML classifier strongly flags this PDF as malicious. No specific family could be identified.

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` `358fc7385824307fb7b0b9a0186db2ebc4211007db4554726e6c2f1083cd9dab`	pdf-javascript-stream	PDF /JS object 1 at offset 0x4619	354 bytes

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