An alternative way of generating PDF files with PHP is using FPDF, a free PHP class containing a number of functions for creating and manipulating PDFs. The key word here is free.

The vulnerability impacts TCPDF, one of the "big three" PHP libraries --together with mPDF and FPDF-- for converting HTML code to PDF docs or assembling PDF files on the fly.

General information on the PDF format The P ortable D ocument F ormat (PDF) is a file format that allows files from numerous applications (word processing, graphics, etc.) to be displayed on different ...