Updated Feb 2026 • 5 min read
PDFs are the most popular document format in the world. Unfortunately, that popularity makes them a prime target for cybercriminals. Whether it is stealing sensitive data *from* your PDF, or injecting malware *into* a PDF to attack your computer, file safety is no longer optional.
Here are the top expert tips for keeping your digital life secure.
Not all protection is created equal. Some tools only apply "Restrictions" (preventing printing or copying). This is not security; it's just annoyance. A skilled user can remove restrictions in seconds.
Encryption (which our tool uses) actually scrambles the file contents. You want to make sure you are using AES-128 or AES-256 encryption. This ensures that even if a hacker steals the file, they cannot see what is inside.
A common attack vector involves sending you a PDF that looks like an invoice. When you open it, it asks you to "Click here to view secure content."
Rule of Thumb: Never click links inside a PDF unless you are 100% sure of the source. Malicious PDFs can run Javascript code or direct you to fake login pages to steal your Google or Microsoft credentials.
Yes, PDFs can run code. Adobe Reader allows Javascript execution by default, which is how many viruses spread. If you want to be extra safe:
This disables most interactive forms, but it makes you immune to a vast majority of PDF-based malware.
We see this in the news constantly: A lawyer tries to hide a name by drawing a black rectangle over it in Microsoft Word or a basic PDF editor.
This does not work. The text is still underneath the black box. Anyone can just copy-paste the text out. To properly hide information, you must use a dedicated Redaction Tool that physically removes the text data from the file code.
If you use an old version of Adobe Reader or a PDF viewer from 2018, you are vulnerable. Hackers find "Zero Day" exploits in these programs constantly. Ensure your viewing software is set to auto-update.
Security is a mindset. By using strong passwords, proper encryption tools, and being wary of incoming files, you can ensure your PDFs are a tool for productivity, not a liability.