PDF malware analysis — malicious · a087bce3b423147e

MALICIOUS

PDF

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

MD5: 5204549bb81850e3de5cfdf9c9b4fc2b SHA-1: 6b671542802ad6a75526e6d3a0625f988d32d193 SHA-256: a087bce3b423147e1c925b9102338aa1471c14698fcf478fa45902c7b20f9023

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. The 'PDF_METADATA_EVAL_STAGER' heuristic specifically indicates that JavaScript within the PDF metadata is used as a stager to decode and execute a payload. The presence of 'String.fromCharCode' further supports the use of JavaScript for obfuscation and execution. 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` `03bb716bd834456a777982a052cac5502b2957fb6f562be3931cad27f5a81cb0`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6286	459 bytes

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