PDF malware analysis — malicious · b2198bfbd99797e0

MALICIOUS

PDF

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

MD5: 46e100fa73c22d8e57af382500aa0108 SHA-1: 703d8341e852fc270a60e48610eeddafa15d29af SHA-256: b2198bfbd99797e09834775733879c8706aa4198b02e7599bb7ab5c724744bfc

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, identified by heuristics such as 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_METADATA_EVAL_STAGER'. The JavaScript uses 'String.fromCharCode' to decode a stager, which is likely responsible for downloading and executing a second-stage payload. The presence of 'String.fromCharCode' in the DOC BODY and its use in JavaScript decoding suggests a common obfuscation technique for initial payload delivery.

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` `68921bdd65f97cac8f6e7a456a9a47cc2951107af5407fcfa31d4fc4172d2563`	pdf-javascript-stream	PDF /JS object 1 at offset 0x629C	523 bytes

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