SEO pdf page

Hello, I need SEO review and fix for my pdf pages. I want to include noindex on all pdf page. Whoever, when I fetch with search engine, some show the noindex, some do not show. Also pdf rending by search engine look like garbage, unreadable character. Please see sample of fetching result. I need someone who is familiar with pdf SEO setting. sample of pdf page fetching: HTTP/1.1 200 OK Cache-Control: max-age=604800 Connection: Keep-Alive Date: Wed, 06 Feb 2019 19:37:41 GMT Keep-Alive: timeout=2, max=102 Content-Length: 3285230 Content-Type: application/pdf Expires: Wed, 13 Feb 2019 19:37:41 GMT Server: Apache Set-Cookie: zenid=deleted; expires=Thu, 01-Jan-1970 00:00:01 GMT stream H�L�ͪe5�����N%�T�@Eq 8s,�FZ��~{�U��ڣs*��Z���~���>����������U������o��۟>������?�����_.n�?*Z���]�=~��䰏~��W3�����"oj�6�q'�7)���T�{ź��2��/<�le/�ެY|�K'Q��<i�ZQ�2)�]�>Vx�U��ڵ��p���5�{鳥l{\/���y�2�4�ؔ�纮Oh�2b��\�Z���[�fKA�@�@ӥ�KmX�"�u�ZK�Od�xy�j���wG���ګƮ�����
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