Safety Tips for Adobe Reader

do the following two steps to disable: i) JavaScript, and ii) opening of attachments using other program inside pdf:

step 1: go to "編集" tab, select "環境設定".
step 2: locate "JavaScript" on the left, and uncheck the box named "Acrobat JavaScript".

step 1: go to "編集" table, select "環境設定".
step 2: locate "信頼性管理マネージャー", and uncheck the box named "外部アプリケーションでPDF以外の添付ファイルを開くことを許可".