PDF malware analysis — malicious · df87d0fc3a88ac18

MALICIOUS

PDF

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

MD5: 796482781c3f2cb4a35fded158a1ae5e SHA-1: eac16676b9d87ea599f9a8be859a43b70adcaca6 SHA-256: df87d0fc3a88ac18104cbdfc71a631187977e41faa6715b73ce8f06789f19bd3

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, indicated by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. The 'PDF_METADATA_EVAL_STAGER' firing suggests that the JavaScript is used to decode and execute further malicious code, likely from within the PDF's metadata. The use of 'String.fromCharCode' further supports the obfuscation and dynamic execution of JavaScript. The primary purpose appears to be the execution of a second-stage payload.

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` `902e5a3640761634d1973034598877c26468d75fcd7cc7947718238fd0281946`	pdf-javascript-stream	PDF /JS object 1 at offset 0x630A	515 bytes

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