PDF malware analysis — malicious · 1a7a15eba28e47b5

MALICIOUS

PDF

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

MD5: 46db04cd6e44442cb746c4b5131e476e SHA-1: f5420f434828793c9e5424a5dd7d38738e47c843 SHA-256: 1a7a15eba28e47b50e2b7a38199fee50a89f5e3111df88682617490ccbd87c30

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. Specifically, the 'PDF_METADATA_EVAL_STAGER' heuristic indicates that JavaScript within the PDF metadata is used to decode and execute a stager. The 'String.fromCharCode' function is used, suggesting obfuscation of the JavaScript code. The primary purpose appears to be the execution of a stager, likely to download and run a second-stage payload, though no specific URLs or further execution details were extracted.

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` `d6ba65eb641bb23d2dbd6108a41efac16163eeaa3e227a91fb8b7664ced91993`	pdf-javascript-stream	PDF /JS object 1 at offset 0x621B	522 bytes

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