OLE_MTEF_NATIVE_CODE_STUB — Equation Native stream begins with native-code stub

critical OLE_MTEF_NATIVE_CODE_STUB

What it means

An oversized Equation Native stream begins with executable x86 control-transfer code.

Why it fires

The rule identifies exploit payload code but intentionally leaves CVE attribution unset unless the malformed MTEF FONT, SIZE, or MATRIX primitive is independently validated.

Other Office heuristics

OLE_VBA_AFFINE_MSI_DOWNLOADER OLE_VBA_AUTOEXEC_FRAGMENTED_SHELL OLE_VBA_DESTRUCTIVE_WORKBOOK_SHUTDOWN OLE_VBA_BIDIRECTIONAL_MACROCOPY_REPLICATION OOXML_BRAND_LINK_MISMATCH_LURE CVE_2016_7262 POLYGLOT_OOXML_REL_COMMAND OLE_RAW_PCODE_CROSS_DOCUMENT_REPLICATION OLE_VBA_CROSS_WORKBOOK_REPLICATION OOXML_XLM_DANGEROUS_FN OFFICE_DEFAULT_PASSWORD_VBA_DROP_EXEC OFFICE_EMBEDDED_SWF EMBEDDED_OFFICE_CHILD_STATIC_TRIAGE OFFICE_EMBEDDED_MACRO_OBJECT OLE_EMBEDDED_EXE OLE_VBA_EMBEDDED_PE_DROPPER OLE_ENCRYPTED_AND_MALFORMED CVE_2017_11882_EQUATION_NATIVE_CMD_RELATED CVE_2017_11882 OLE_EQUATION_OLE10NATIVE_DOWNLOADER OLE_EQUATION_OLE10NATIVE_SHELLCODE OOXML_XLM_MACRO_IN_WORKSHEET OLE_XLS5_LAROUX_MACRO_VIRUS OLE_VBA_XLSTART_WORKBOOK_PERSISTENCE