PDF malware analysis — malicious · 3f0fe13392f76c6c

MALICIOUS

PDF

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

MD5: 873e772e7a0546deb74d28fb1928d836 SHA-1: 0891dc4c09d9366ced4eed77b586f6417a62e64c SHA-256: 3f0fe13392f76c6c41dd11232adaf72ce6e63a2f9fdbdcd04a8b801845e41958

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_METADATA_EVAL_STAGER'. The JavaScript uses 'String.fromCharCode' to decode obfuscated code, which is then likely executed. This technique is commonly used to download and run a second-stage payload. The 'authoring_application' field also explicitly references 'String.fromCharCode', further indicating the use of this obfuscation method.

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` `3cb8f573ce9fc6bc937dbbca311d4945444de184d9064dadf860372a779e3156`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6217	458 bytes

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