(with-eval-after-load 'pdf-tools
   (add-hook 'pdf-view-mode-hook #'pdf-view-themed-minor-mode))

(with-eval-after-load 'pdf-tools
  (defun my-pdf-tools-refresh-themed-buffers (_theme)
    (dolist (buffer (buffer-list))
      (with-current-buffer buffer
        (when (eq major-mode 'pdf-view-mode)
          (pdf-view-refresh-themed-buffer t))))))

(with-eval-after-load 'pdf-tools
  (add-hook 'enable-theme-functions
            #'my-pdf-tools-refresh-themed-buffers))