Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a4d5072f4b86f2…

MALICIOUS

PDF

12.2 KB
MD5: d8a977cbb8d942b5c00a7d960db56a98 SHA-1: ac734a60b3c286cbf09e630632fdcd4b9975b7cb SHA-256: 67a4d5072f4b86f2f87a25cb50ed74c41a8216326e2f7f1995218a11bb44ff71
116 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains an embedded script payload and an embedded file, indicating it is designed to exploit vulnerabilities and drop a secondary payload. The ClamAV detection 'Pdf.Exploit.Dropped-78' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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
fa04a5c46694c23f92cf50baf8d9008c9368295041895a13c0d31a93c25ea2af		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11758 bytes

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