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PDF_SPARSE_MOVED_ARTICLE_DOORWAY
What it means
A nearly empty PDF says an article moved and supplies one external action.
Why it fires
This is typically an abusive traffic doorway; it is suspicious but does not imply embedded code execution.
Other Social engineering heuristics
SE_BOOKING_COMPLAINT_PHISH PDF_FAKE_DOCUMENT_COMPONENT_INSTALLER OOXML_QR_CREDENTIAL_PHISH SE_CALLBACK_SCAM_TEMPLATE PDF_BRAND_ACCOUNT_UPDATE_REDIRECT_LURE PDF_IMAGE_REPEATED_DECOY_REDIRECT_LURE PDF_IMAGE_DOCUMENT_REVIEW_HOST_LURE PDF_LOCALIZED_DOWNLOAD_HOSTING_LURE PDF_MINIMAL_VIEW_DOCUMENT_REDIRECT PDF_NESTED_ENCODED_CROSSHOST_REDIRECT PDF_RFP_EXTERNAL_ACTION_LURE PDF_UTILITY_REFUND_OFFDOMAIN_LURE