【工具】PDF解密

概述：PDF文件结构及解密相关工具

Blogs explaining the internals of PDF

1. https://www.adobe.com/devnet/pdf/pdf_reference.html
2. https://resources.infosecinstitute.com/pdf-file-format-basic-structure/
3. https://planetpdf.com/navigating-the-internal-structure-of-a-pdf-document/
4. https://blog.idrsolutions.com/2013/01/understanding-the-pdf-file-format-overview/
5. https://web.archive.org/web/20141010035745/http://gnupdf.org/Introduction_to_PDF
6. https://www.w3.org/WAI/WCAG20/Techniques/ua-notes/pdf

Tools

1. PdfView - Peeking into the Internals of PDFs - View the structure of PDF
2. xpdf - Extracting text etc…
3. pdf2xml - Extracting structure etc…
4. Dragon00007/DecryptPDF: Decrypt/Unlock pdf files