PDF malware analysis — malicious · 2e449976fac37b73

MALICIOUS

PDF

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

MD5: aeae3e23c4b1ecb32a0e7a76b7b737bc SHA-1: 8a855d5f84c9e7a0198629c1ae17ae755dd423a0 SHA-256: 2e449976fac37b7377893aff19baeafe849ae7f5d025c6ce8ebc6c4801193b00

94 Risk Score

Malware Insights

MITRE ATT&CK

T1564.002 Hide Artifacts: Obfuscated Files or Information

The PDF contains JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. The 'PDF_METADATA_EVAL_STAGER' heuristic indicates that this JavaScript is used to decode and execute a payload, likely leveraging 'String.fromCharCode' as suggested by another firing. The ML classifier strongly indicates maliciousness. No specific family could be identified, and no network IOCs were extracted.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

PDF metadata JavaScript eval stager high PDF_METADATA_EVAL_STAGER

PDF JavaScript reads document metadata fields such as title, subject, or producer, decodes character data with parseInt/String.fromCharCode style helpers, and evals the recovered stage. This is a high-signal exploit-kit staging pattern.
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` `37c88aa2b57b90db35f14432bdc007233fb7c065705f50137f06aaf0decde7c7`	pdf-javascript-stream	PDF /JS object 1 at offset 0x628F	525 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.