PDF malware analysis — malicious · a460aee8745455c9

MALICIOUS

PDF

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

MD5: 8c5b559f2a5b58a06c1ff116c08b8c72 SHA-1: 59997511ac146310e136cfa57d9587dcfafc090a SHA-256: a460aee8745455c977c0f2db8185f6fd74c6b1144a73d0907ef7ecbc782fdd6e

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, specifically utilizing String.fromCharCode and a metadata eval stager. This indicates the file is designed to execute arbitrary JavaScript code upon opening. The embedded JavaScript stream, named 'javascript_obj0001_000.js', is the primary artifact. The script likely acts as a downloader, fetching and executing a second-stage payload, though its exact function is obscured by 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` `1893da92c0b7e1716b6496f9900d22613e2bc18886e64b5090b4ce65d719c55d`	pdf-javascript-stream	PDF /JS object 1 at offset 0x62CA	513 bytes

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