PDF malware analysis — malicious · eae84eacfeadef80

MALICIOUS

PDF

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

MD5: 59adc04208ff74bed779f10b41767c78 SHA-1: f54008767c78226bd6d6b2b512b1821a44de6825 SHA-256: eae84eacfeadef80c4f79e7b6280fb86cd8a1f16fdb109b5bb45950995a1cb2a

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' and 'PDF_JS'. A specific heuristic, 'PDF_METADATA_EVAL_STAGER', indicates that JavaScript within the PDF metadata is used to decode and execute a stager. This stager is likely responsible for downloading and executing a secondary payload. The 'String.fromCharCode' usage further supports the obfuscation technique employed by the script.

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` `3830b6b2afa24137f81246255d7b2eaab0729ef5e5bdde5c859820cdeb725572`	pdf-javascript-stream	PDF /JS object 1 at offset 0x62B6	524 bytes

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