PDF malware analysis — malicious · 7bedff27493af20d

MALICIOUS

PDF

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

MD5: 8a66325a2631d2adef802c99dad52946 SHA-1: 9f257b66b0895c5afda8142e0ef526f6e66979f4 SHA-256: 7bedff27493af20d2d7fdd62b6fff78ad7366af262255271e358016486fc8e87

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_METADATA_EVAL_STAGER' heuristic, which is designed to decode and execute a payload. The use of String.fromCharCode further indicates obfuscation techniques common in malicious PDFs. The primary attack vector appears to be leveraging JavaScript execution within the PDF metadata to achieve initial compromise.

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` `1490235fcf990da6a7094ce48570baed1771e13e8b3e41818c4378b1e35d989e`	pdf-javascript-stream	PDF /JS object 1 at offset 0x620E	524 bytes

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