PDF malware analysis — malicious · ae3e1e878af9b73e

MALICIOUS

PDF

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

MD5: 7bf6bd2336b219495d7a7a011ccd54c8 SHA-1: c1129987345fe7679ca4a0ff379dd6495325f9fd SHA-256: ae3e1e878af9b73eabf4ce8c743f443c14827fad53fd3122802b019dafce3083

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_METADATA_EVAL_STAGER' heuristics. The 'String.fromCharCode' usage suggests obfuscation. The primary function appears to be executing a stager from the PDF metadata, which likely downloads and executes a second-stage payload. No specific family could be identified.

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` `2540569285e37e1f82c6dc210cb3e99c6a8606581c258b68fc08f2ee6e879a8a`	pdf-javascript-stream	PDF /JS object 1 at offset 0x61DE	469 bytes

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