You can specify which file types are allowed for ticket attachments. Then users can only attach files of these types to the tickets.
Required configuration key:
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File types for ticket attachments (AttachmentFileTypes): Specifies which file type are permitted for ticket attachments. 
To configure file types for ticket attachments
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Log in to the Administration Portal (see Logging in to the Administration Portal). 
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In the navigation, click Configuration. 
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On the Configuration page, in the Show configuration for the following API project menu, select the Web Portal API project. 
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Expand the File types for ticket attachments configuration key. 
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You can perform the following actions: - 
To add a file type, click New and enter the file type in the format .<file extension> (such as .png). 
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To change an existing file type, click in the corresponding input field and change the value. 
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To remove an existing file type, next to the relevant file type, click (Delete). 
 
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Click Apply. 
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Perform one of the following actions: - 
If you want to apply the changes locally only, click Apply locally. 
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If you want to apply the changes globally, click Apply globally. 
 
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Click Apply. 
