PDF malware analysis — malicious · 28ea584cdce79178

MALICIOUS

PDF

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

MD5: 5b4fe5c6c449fb5b7c053499e6faf4a7 SHA-1: 4d299e42db8b4d3020d48b5e38181e290e335084 SHA-256: 28ea584cdce7917892501c536f40bf430d84cbfabb66495561912f68fd9b7ead

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_METADATA_EVAL_STAGER'. The 'String.fromCharCode' usage suggests obfuscation of JavaScript code within the PDF's metadata. This JavaScript is likely responsible for downloading and executing a second-stage payload. The confidence is moderate due to the obfuscated nature of the script and lack of specific IOCs beyond the function name.

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` `cdd46a0f4ab8f0927c15ba3534a090928457aa8d09e724875ab2d79eea068755`	pdf-javascript-stream	PDF /JS object 1 at offset 0x621B	462 bytes

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