PDF malware analysis — malicious · 834b8044f13b69a3

MALICIOUS

PDF

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

MD5: 85b002f0090095cbe82181a7908f6a95 SHA-1: 02cb9dff88a2af1ffdfaea7f35fcc2aab6ff8b22 SHA-256: 834b8044f13b69a3dd364cda67fc4fc79accd1d09f8ee27a3fb4c7a81ec5fe26

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. The 'PDF_METADATA_EVAL_STAGER' heuristic indicates that JavaScript within the PDF's metadata is used to decode and execute further code. The presence of 'String.fromCharCode' further suggests obfuscation techniques common in JavaScript-based downloaders. No specific family could be identified, but the techniques point to a downloader attempting to execute a second-stage payload.

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` `9ebfede21cbe07b579ce7a65421e1d17479ca6dfb9cc9c54ac0955314aa404ac`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6300	527 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.