PDF malware analysis — malicious · d720ded0379d8c73

MALICIOUS

PDF

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

MD5: 4b507051e53e1e9a2c84f1a6fac638d9 SHA-1: 3bdafbb2d19352038545652ef0717297d262da7a SHA-256: d720ded0379d8c7349c4bbe3a929f6100a4f8f22ba137a10e32d429e17322678

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains JavaScript embedded within its metadata, which is a common technique for obfuscating malicious code. The heuristic 'PDF_METADATA_EVAL_STAGER' indicates that this JavaScript is likely used to decode and execute a secondary payload. The use of 'String.fromCharCode' further suggests code obfuscation. While no specific family is identified, the overall pattern points to a downloader or stager.

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` `564eba3370e1e3b77064e9d63883a625e7a908121354eb36a2b0386fa87d9752`	pdf-javascript-stream	PDF /JS object 1 at offset 0x628C	516 bytes

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