> A pdf file
pdf files can be setup in a fillable manner(generally used for forms) meaning it has to use from form of executtion to both read and write into these files(usually javascript that CAN carrry malicious code).
as for word documents, microsoft word at least implements a form of scripting that is normally used to automate tasks inside the application and because its a microsoft product it has some interoperability with the windows OS.
when viewing then online, you are seeing them in protected mode which disables every script the file may have so nothing malicious can execute….unless you allow it to by opening the file for editing
aka: dont open microsoft office files you do not trust the soruce from.
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