The Wildfire analysis file size limit for Windows PE files is 100MB. Windows PE files are executable files that run on the Windows operating system, such as .exe, .dll, .sys, or .scr files. Wildfire is a cloud-based service that analyzes files and URLs for malicious behavior and generates signatures and protections for them. Wildfire can analyze various file types, such as PE, APK, PDF, MS Office, and others, but each file type has a different file size limit. The file size limit determines the maximum size of the file that can be uploaded or forwarded to Wildfire for analysis. If the file size exceeds the limit, Wildfire will not analyze the file and will return an error message.
According to the Wildfire documentation1, the file size limit for Windows PE files is 100MB. This means that any PE file that is larger than 100MB will not be analyzed by Wildfire. However, the firewall can still apply other security features, such as antivirus, anti-spyware, vulnerability protection, and file blocking, to the PE file based on the security policy settings. The firewall can also perform local analysis on the PE file using the Cortex XDR agent, which uses machine learning models to assess the file and assign it a verdict2.
Reference:
WildFire File Size Limits: This document provides the file size limits for different file types that can be analyzed by Wildfire.
Local Analysis: This document explains how the Cortex XDR agent performs local analysis on files that cannot be sent to Wildfire for analysis.

Phishing is a technique that belongs to two MITRE ATT&CK tactics: Reconnaissance and Initial Access. Reconnaissance is the process of gathering information about a target before launching an attack. Phishing for information is a sub-technique of Reconnaissance that involves sending phishing messages to elicit sensitive information that can be used during targeting. Initial Access is the process of gaining a foothold in a network or system. Phishing is a sub-technique of Initial Access that involves sending phishing messages to execute malicious code on victim systems. Phishing can be used for both Reconnaissance and Initial Access depending on the objective and content of the phishing message. Reference:
Phishing, Technique T1566 - Enterprise | MITRE ATT&CK 1
Phishing for Information, Technique T1598 - Enterprise | MITRE ATT&CK 2 Phishing for information, Part 2: Tactics and techniques 3 PHISHING AND THE MITREATT&CK FRAMEWORK - EnterpriseTalk 4 Initial Access, Tactic TA0001 - Enterprise | MITRE ATT&CK 5

If all alerts contained in a Cortex XDR incident have exclusions, the Cortex XDR console will automatically mark the incident as Resolved - False Positive. This means that the incident was not a real threat, but a benign or legitimate activity that triggered an alert. By marking the incident as Resolved - False Positive, the Cortex XDR console removes the incident from the list of unresolved incidents and does not count it towards the incident statistics. This helps the analyst to focus on the true positive incidents that require further investigation and response1.
An exclusion is a rule that hides an alert from the Cortex XDR console, based on certain criteria, such as the alert source, type, severity, or description. An exclusion does not change the security policy or prevent the alert from firing, it only suppresses the alert from the console. An exclusion is useful when the analyst wants to reduce the noise of false positive alerts that are not relevant or important2.
An exception, on the other hand, is a rule that overrides the security policy and allows or blocks a process or file from running on an endpoint, based on certain attributes, such as the file hash, path, name, or signer. An exception is useful when the analyst wants to prevent false negative alerts that are caused by malicious or unwanted files or processes that are not detected by the security policy3.
A BIOC rule is a rule that creates an alert based on a custom XQL query that defines a specific behavior of interest or concern. A BIOC rule is useful when the analyst wants to detect and alert on anomalous or suspicious activities that are not covered by the default Cortex XDR rules4.
Reference:
Palo Alto Networks Cortex XDR Documentation, Resolve an Incident1
Palo Alto Networks Cortex XDR Documentation, Alert Exclusions2
Palo Alto Networks Cortex XDR Documentation, Exceptions3
Palo Alto Networks Cortex XDR Documentation, BIOC Rules4

Quarantine is a feature of Cortex XDR that allows you to isolate a malicious file from its original location and prevent it from being executed. Quarantine works by moving the file to a protected folder on the endpoint and changing its permissions and attributes. Quarantine can be applied to files detected by periodic scans or by behavioral threat protection (BTP) rules. Quarantine is only supported for portable executable (PE) and dynamic link library (DLL) files. Quarantine does not affect the network connectivity or the communication of the endpoint with Cortex XDR. Reference:
Quarantine Malicious Files
Manage Quarantined Files

To add an exception to exclude a specific file hash from examination by the Malware profile for a Windows endpoint, you need to use the Action Center in Cortex XDR. The Action Center allows you to create and manage actions that apply to endpoints, such as adding files or processes to the allow list or block list, isolating or unisolating endpoints, or initiating live terminal sessions. To add a file hash to the allow list, you need to choose Allow list, select new action, select add to allow list, add your hash to the list, and apply it. This will prevent the Malware profile from scanning or blocking the file on the endpoints that match the scope of the action. Reference: Cortex XDR 3: Responding to Attacks1, Action Center2