PDF malware analysis — malicious · f65b38effa707f5a

MALICIOUS

PDF

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

MD5: 42a30120368b81c956544492ec614c72 SHA-1: 7fcb0784419938a60410b25ee80ac88c23a4abf7 SHA-256: f65b38effa707f5aee805260d6e2b23b60caf2af64afa5c3a48ea71f4fa340df

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: 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 within the JavaScript. The primary function of this script appears to be decoding and executing further malicious code, acting as a stager for a second-stage payload. No specific malware family could be identified.

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` `911c78f641fbd56512dcc17feb3fa7a783cc0b32c7fc07c4a3284cbcfa5aa6dd`	pdf-javascript-stream	PDF /JS object 1 at offset 0x615B	429 bytes

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