VBO Custom Operation to create pdf of selected nodes detail page
You can achieve this using rules. Import following component &amp; add Rule component in Views bulk operation list as shown in figure below:

{ "rules_create_pdf" : {
    "LABEL" : "Create PDF",
    "PLUGIN" : "action set",
    "OWNER" : "rules",
    "REQUIRES" : [ "php", "rules" ],
    "USES VARIABLES" : { "node" : { "label" : "Node", "type" : "node" } },
    "ACTION SET" : [
      { "php_eval" : { "code" : "$view = node_view($node, \u0027PDF\u0027);\r\n$html = drupal_render($view);\r\npdf_using_mpdf_library_exist();\r\n_pdf_using_mpdf_generator($html, \u0027node-\u0027.$node-\u003Enid);" } }
    ]
  }
}


In order to save PDF files at server use above Rule component &amp; comment two line given below in pdf_using_mpdf.module of function _pdf_using_mpdf_generator. You can find that on line no. 324 &amp; 325 of pdf_using_mpdf 7.x-2.6.

//drupal_goto($_SERVER['HTTP_REFERER']);
//exit;


Figure: