pdfer.rb

require 'pdf_forms'
require 'cliver'

input_data = {
  ssn:        '123-23-1234',
  birthday:   '02/14/1980',
  color:      'Excella Red',
  first_name: 'John Smith'
}

@pdftk = PdfForms.new(Cliver.detect('pdftk'))

fill_values = {}
fill_values['ssn']        = input_data[:ssn]
fill_values['birthday']   = input_data[:birthday]
fill_values['color']      = input_data[:color]
fill_values['first name'] = input_data[:first_name]

@pdftk.fill_form './Fillable.pdf', 'dynamic.pdf', fill_values