pdfgrep

pdfgrep is a tool for searching text in PDF files. It works similarly to grep but for PDF

▫Many of your favorite grep parameters are supported (e.g. -k, -i, -t, or -c).
▫Search in many PDF files simultaneously, even recursively in directories
▫regular expressions: Posix or PCRE
▫color output
▫Support for password-protected PDF files