What is a PDF prompt injection?

It is a security vulnerability where malicious instructions are hidden inside a PDF using tiny text, hidden layers, or off-page placement to manipulate the behavior of an AI reading the document.

How does this scanner detect hidden text?

It extracts the PDF text twice: once with safety filters enabled and once with them disabled. Any text that only appears in the unfiltered run is flagged as potentially hidden.

What types of risks can it scan for?

The tool can scan for hidden text, off-page content, tiny text, and hidden layers (OCG).

Can I sanitize sensitive data during the scan?

Yes, you can enable the Sanitize Sensitive Data option to redact sensitive information while scanning for injection risks.

What format is the scan report?

The tool generates an HTML report featuring category badges and previews of the suspicious text snippets found in the document.

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PDF Prompt Injection Scanner

Compare safe and unsafe PDF extraction runs to detect hidden text, off-page content, tiny text, and hidden-layer prompt injection risks

Details

What this tool helps you do

Run OpenDataLoader with default safety filtering and compare it against targeted unsafe runs where one safety category is disabled at a time. The tool highlights extra text that only appears when a specific filter is removed, which is a practical signal for hidden prompt-injection attempts in PDF workflows.

Execution

Run this tool

Fill in the form, run the tool, and review the result in one place.

Prepared example runs

Click an example to fill the form automatically. File inputs still need an upload.

1 examples

Scan a PDF before sending it to an LLM workflow

Disable safety categories one by one and inspect whether extra hidden text appears only in unsafe extraction runs.

<div>Prompt-injection risk report scanning hidden-text, off-page, tiny, and hidden-ocg with no suspicious categories found in the sample PDF.</div>

Inputs

Set the required fields, then run the tool.

7 options

FilesUpload source files for this workflow.1

PDF FilefileRequired

Supported types: application/pdf

TogglesEnable or disable optional behavior.6

Scan Hidden TextcheckboxOptionalEnabled when checkedScan Off-page ContentcheckboxOptionalEnabled when checkedScan Tiny TextcheckboxOptionalEnabled when checkedScan Hidden LayerscheckboxOptionalEnabled when checkedUse Struct TreecheckboxOptionalEnabled when checkedSanitize Sensitive DatacheckboxOptionalEnabled when checked

Result

Ready for a run

Run the tool to preview files, text, structured data, or streamed output here.

Samples

PDF Prompt Injection Scanner

What this tool helps you do

Run this tool

Prepared example runs

Inputs

Result

Examples that match this tool

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Prepared example runs

Inputs

Result

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Securing an LLM Resume Screener

2. Auditing Financial Reports for RAG

FAQ

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