fix pdf fields extract

app/controllers/templates_debug_controller.rb

@@ -6,9 +6,10 @@ class TemplatesDebugController < ApplicationController
   def show
     attachment = @template.documents.first
 
-    pdf = HexaPDF::Document.new(io: StringIO.new(attachment.download))
+    data = attachment.download
+    pdf = HexaPDF::Document.new(io: StringIO.new(data))
 
-    fields = Templates::FindAcroFields.call(pdf, attachment)
+    fields = Templates::FindAcroFields.call(pdf, attachment, data)
 
     attachment.metadata['pdf'] ||= {}
     attachment.metadata['pdf']['fields'] = fields

lib/templates/find_acro_fields.rb

@@ -32,8 +32,8 @@ module Templates
     module_function
 
     # rubocop:disable Metrics
-    def call(pdf, attachment)
+    def call(pdf, attachment, data)
-      return [] unless pdf.acro_form
+      return [] if pdf.acro_form.blank? && data.exclude?('/Form')
 
       fields, annots_index = build_fields_with_pages(pdf)
 

lib/templates/process_document.rb

@@ -22,7 +22,7 @@ module Templates
         if extract_fields && data.size < MAX_FLATTEN_FILE_SIZE
           pdf = HexaPDF::Document.new(io: StringIO.new(data))
 
-          fields = Templates::FindAcroFields.call(pdf, attachment)
+          fields = Templates::FindAcroFields.call(pdf, attachment, data)
         end
 
         generate_pdf_preview_images(attachment, data, pdf, max_pages:)