PDF malware analysis — malicious · ecc965f3b78233f3

MALICIOUS

PDF

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

MD5: 3dca9c46f3c17dae879035a5a3b768bc SHA-1: dbb2b312064329bbce28cc465322415c94a5914f SHA-256: ecc965f3b78233f3c2f80335335acdbffe407985b04c2d2bdaa7ed03d060058e

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, specifically utilizing String.fromCharCode and a metadata eval stager, which are common techniques for obfuscating malicious code. The primary heuristic indicates a PDF metadata JavaScript eval stager, suggesting the script decodes and executes a secondary payload. While no specific URLs or further script content were extracted, the presence of these obfuscation techniques and the malicious verdict strongly suggest an attempt to deliver a malicious 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` `999f09accbf0c51b020fd19c0621c05b030c714bc97a1e48227d4cb633117c54`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6342	523 bytes

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