PDF malware analysis — malicious · df74e1660ee5ff62

MALICIOUS

PDF

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

MD5: 51c0a7440530400673df29fd0efc8cb0 SHA-1: 1703cd789ca46a30791aabcd78b6df39d8e443c2 SHA-256: df74e1660ee5ff62db2735ab21812058224e769a394df279cb148b72389a3b0a

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains JavaScript embedded within its metadata, triggered by a PDF_METADATA_EVAL_STAGER heuristic. The JavaScript uses String.fromCharCode, indicating a decoding or obfuscation routine. This pattern suggests the document is designed to download and execute a second-stage payload. No specific family is identified due to the generic nature of the obfuscation.

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` `42b44020c5a93298f1ec1da779985dc69ad88a1996f58186e63fb0af6944c756`	pdf-javascript-stream	PDF /JS object 1 at offset 0x625E	445 bytes

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