PDF is so feature-rich that the specification includes its own version of JavaScript, capable of communicating with external web servers, executing system shell commands, or triggering heap-overflow exploits in outdated desktop readers. Cybersecurity teams routinely treat external PDFs as potential threat vectors.
#1Common Vectors for PDF Exploits
`/JavaScript` Dictionaries: Scripts designed to execute automatically when the document is opened (`/OpenAction`), triggering phishing popups or credential loggers.
`/Launch` Actions: Commands attempting to execute external binaries or PowerShell scripts on the victim's operating system.
`/URI` Phishing Traps: Obfuscated links designed to redirect users to credential-harvesting login clones.
#2Sanitizing Files with WebAssembly Normalization
MistPDF's engine executes inside a strictly sandboxed WebAssembly environment that has zero access to your local Windows or Mac file system or terminal.
When you pass a file through our Flatten or Repair tool, all executable `/JavaScript`, `/Launch`, and external event handlers are stripped completely, producing a clean, safe, static vector document.
Conclusion
Protect your corporate network from document-based phishing and exploits. Sanitize untrusted PDF attachments with MistPDF.
Perguntas Frequentes
Can opening a malicious PDF in MistPDF infect my computer?
No. Because MistPDF runs inside the secure browser sandbox, malicious desktop reader exploits cannot escape to infect your operating system.
Does sanitizing remove legitimate document text?
No. Sanitization only purges interactive executable scripts; all visible text, design artwork, and tables remain completely intact.