MALICIOUS
62
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
The primary PDF file exhibits characteristics of an image-only lure, containing no readable text operators but instead embedding a secondary PDF. This embedded PDF triggered multiple critical heuristics, including 'POLYGLOT_CHILD_PDF_STATIC_TRIAGE', indicating suspicious static findings within the child document. The overall structure suggests a multi-stage attack where the initial PDF serves as a container for more malicious content.
Machine Learning
- Nyx PDF Classifier clean score 0.0002
Heuristics 2
-
Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGEA valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
-
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LUREPDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
polyglot_child_pdf_off0000000f.pdf0a0bb35bb011b32e5bd039fbfcee63c659fa68d830087d2866b2145b149048cf |
polyglot-child-pdf | Secondary PDF body inside pdf container at offset 0xF | 312095 bytes |
Open this report in the interactive analyzer, or submit your own file for analysis.