During  the threat actors sent phishing emails that included a PDF document that in some cases led to the download and execution of malware.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request. ### Instruction: List the MITRE techniques contained in the text. ### Input: During  the threat actors sent phishing emails that included a PDF document that in some cases led to the download and execution of malware. ### Response: T1566.001.