PDF malware analysis — malicious · fe6ea623d056faf9

MALICIOUS

PDF

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

MD5: 6a8f7436a131a00d3275ff3f9b86255e SHA-1: 39e6319bd3e4d08fad1563ee281e958fd86b34ae SHA-256: fe6ea623d056faf905e3ea5c0f4659758362f074887bb9d1a5d32456caf0c8d3

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_METADATA_EVAL_STAGER'. The JavaScript is obfuscated using String.fromCharCode, a common technique to evade static analysis. The primary function of the embedded JavaScript appears to be acting as a stager, likely to download and execute a second-stage payload. The 'PDF_METADATA_EVAL_STAGER' heuristic strongly suggests this behavior. No specific malware family could be confidently 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` `09b5653ccbe35fad35eff5b7b8d1c4a5f7fc6b72705c2977cb15162e184cdc86`	pdf-javascript-stream	PDF /JS object 1 at offset 0x620C	460 bytes

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