PDF malware analysis — malicious · e696f6608051543e

MALICIOUS

PDF

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

MD5: 7d26175431f17014c48f2764dad4e121 SHA-1: 145014c447b772bb56a2df26600880beb764e0a8 SHA-256: e696f6608051543ebbac5d04c17d199b40698fb8b7de0dc0c14ded44385a2f90

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. The 'PDF_METADATA_EVAL_STAGER' heuristic indicates that this JavaScript is used to decode and execute a payload from the PDF's metadata. The use of 'String.fromCharCode' further suggests obfuscation techniques common in JavaScript-based malware. The file's purpose is likely to download and execute a second-stage payload, although the specific URL or execution method is not directly extractable from the provided evidence.

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` `b926dd0e78f5fc8d11a0de016a02dde3fc520bec48bf39a53e2ae11b1992255b`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6368	525 bytes

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