PDF malware analysis — malicious · 2e2217d164d5075b

MALICIOUS

PDF

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

MD5: 3d38641f39529597b7195e9402692fbb SHA-1: f6d0fc820b01c10d8656851127cec19e3ee6e8aa SHA-256: 2e2217d164d5075b686ae389c9bbb936733144703dd83fb1cbfba92e087474cb

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. The embedded JavaScript stream, named 'javascript_obj0001_000.js', is likely responsible for downloading and executing a second-stage payload. The confidence is moderate due to the obfuscated nature of the script and lack of specific family indicators.

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` `4de2f4ca3fd6cf04674bfff81404ed0b2c6607bd33992177061881beb000031f`	pdf-javascript-stream	PDF /JS object 1 at offset 0x62E1	521 bytes

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