Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54d2448c10f63a4…

MALICIOUS

PDF

3.60 MB
MD5: 0ef7debc05372185d6a6c837aff61a92 SHA-1: f4e3e465b7b6a1c87ce744d5284a46869d5da11f SHA-256: a54d2448c10f63a4949e0f5ae4430cf60e2f13b543e2cf6bdd052a99f8fec461
84 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF file exhibits high-confidence indicators of maliciousness, specifically an embedded script payload within a PDF stream. This, combined with the 'EXTRACTED_FILE_STATIC_TRIAGE' heuristic, strongly suggests the document is a lure to execute a secondary payload. The presence of an embedded script points towards an attempt to exploit vulnerabilities or deliver malware through the PDF document itself. The benign URLs are likely decoys or standard PDF metadata.

Machine Learning

  • Nyx PDF Classifier clean score 0.0232

Heuristics 5

  • Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/g/img/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/illustrator/1.0/
    • http://ns.adobe.com/xap/1.0/t/pg/
    • http://ns.adobe.com/xap/1.0/sType/Dimensions#
    • http://ns.adobe.com/xap/1.0/sType/Font#
    • http://ns.adobe.com/xap/1.0/g/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_0018d333.bin
192a9119ba013f5441e8c1953e55e6fba7228cbc58d193678cc5f4264161f2c4		 pdf-embedded-script PDF decompressed stream script payload at offset 0x18D333 3771237 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 82 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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