Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b7e93d63312013…

MALICIOUS

PDF

27.2 KB
MD5: 6b9363ee4326c05785a8c60ed87d9842 SHA-1: 9c9dcc2475e507f6a7d4eacd9c6f7d71917423fb SHA-256: 77b7e93d63312013e9de5c221775bb060a7699d7d96c6897497485b63e93ef88
116 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV with the signature Pdf.Exploit.Dropped-78, indicating it exploits known vulnerabilities. The presence of an embedded script payload and an embedded file further supports its role as a dropper. The benign URLs found do not detract from the malicious nature indicated by the heuristics.

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
72828789b5cb674b36805bf6b224e01df8be31b29aa386883dcbfc6bb61e6c99		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 27112 bytes

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