What is an example of high-risk content that should be handled with caution?

High-risk content refers to any data type that poses a greater likelihood of containing malware, viruses, or sensitive information that could result in data breaches or security vulnerabilities. Binary files from untrusted locations are a prime example of high-risk content because they can execute code or carry malicious payloads. Unlike text or image files, which are generally safer and easier to control, binary files are often used by attackers to distribute harmful software. Given that binary files can come bundled with executable content that can directly interact with a user's system, exercising caution around them is essential.

In contrast, the other options represent less risky scenarios. PDF files from educational institutions, while they should still be scanned for security, typically don’t carry the same level of risk as files from unknown sources due to their well-known origins. Text documents from verified senders are generally considered safe, assuming the sender's identity can be confirmed. Images shared on social media can be monitored but are less likely to pose an immediate risk compared to binary files that can execute harmful operations. Therefore, handling binary files from untrusted locations with caution is critical in maintaining security and protecting information.