PDF malware analysis — malicious · 58b22a5879d06edc

MALICIOUS

PDF

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

MD5: 7242d69a28ff731729063e1f68ec401d SHA-1: 9d45ac5d58e8563874931ff4726594de0a54ecef SHA-256: 58b22a5879d06edcc8f545ce8fe7ad265d1b8285c8b97808b5d2427ed00b1e27

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF sample contains embedded JavaScript, identified by heuristics such as PDF_JAVASCRIPT and PDF_JS. The PDF_METADATA_EVAL_STAGER heuristic indicates that this JavaScript is used to decode and execute a payload, likely leveraging String.fromCharCode as seen in the DOC BODY. No specific malware family could be identified, and no URLs or other IOCs were extracted.

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` `ff6ac648a876691ac15d775b1d1cb1cc0af8dabfaf4826be261629be611a3e06`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6293	526 bytes

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