Malicious PDF — malware analysis report

Static analysis result for SHA-256 663c569d4a15e2bd…

MALICIOUS

PDF

11.7 KB
MD5: 36bff208b02a487c4304eba330335676 SHA-1: 1b571f5c228aa0021d95048858aa8528baa39cc1 SHA-256: 663c569d4a15e2bdda9b47ae4f20bf225363fd88c5560766951a44879ab31af6
118 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ML classification and ClamAV detection (Pdf.Exploit.Dropped-78), indicating it contains an exploit. The presence of an embedded script payload and an embedded file suggests the PDF is designed to download and execute a second-stage payload. The benign URLs present do not detract from the malicious nature indicated by the exploit and embedded content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded script payload in PDF stream low PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • Suspicious extracted artifact info 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.
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
12a380e58739de46f23966b38ad95354dcd8afb1add9ef0339b5dbfe29bed12d		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11173 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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