PDF malware analysis — malicious · a5cf5766ddc497eb

MALICIOUS

PDF

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

MD5: 7b2d741cba4d0172050236406488768a SHA-1: 321367bbefb4f2e02550916ba48f48adf1724084 SHA-256: a5cf5766ddc497ebfccfdfefb6c7729a39810d8c3b1e7f9a538bec5c787bd6c2

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_FROMCHARCODE' heuristics. The 'PDF_METADATA_EVAL_STAGER' heuristic indicates that this JavaScript is used to decode and execute a stager from the PDF's metadata. The presence of 'String.fromCharCode' suggests obfuscation techniques are employed to hide the malicious code. The primary function appears to be the execution of a stager, likely to download and run additional malicious content.

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` `15fad76c357110e7ba5d533d237bdc5d488d14e72d633b4526c2bd7f284865da`	pdf-javascript-stream	PDF /JS object 1 at offset 0x62F4	522 bytes

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