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| Tool | Purpose | Platform | |------|---------|----------| | | Structural analysis, reveals hidden objects | Linux, macOS, Windows | | PDFid | Scan for steganography, JavaScript, embedded files | Windows, Python | | Origami PDF | Ruby framework for analyzing suspicious PDFs | Cross-platform | | Peepdf | Advanced interactive PDF analysis (layers, hidden text) | Linux/macOS | | Adobe Acrobat Pro | Manual inspection of layers, object data, and metadata | Windows, macOS | | Didier Stevens’ PDF tools | detect-zero-opacity-text, extract-embedded | Python |

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| Type | Description | Common Use | |------|-------------|-------------| | | Text set to 0% opacity or white-on-white | Hidden notes, watermarking | | Hidden layers | PDF layers (OCGs) that are turned off by default | Technical drawings, alternate languages | | Metadata invisibility | Hidden author names, edit logs, embedded files | Forensics, privacy | | Steganography | Data hidden within images or fonts | Covert communication, digital watermarking | | Invisible signatures | Digital signatures not visually apparent | Legal validation | | Tool | Purpose | Platform | |------|---------|----------|