Malicious PDF — malware analysis report

Static analysis result for SHA-256 165677bdd4f4f54c…

MALICIOUS

PDF

19.2 KB
MD5: 3ac5fb85c27c49f13e3100f6a6ea0d33 SHA-1: 09e4af99c685edcf308e7df68c544b5ddab68ab3 SHA-256: 165677bdd4f4f54c5cb13d140c253ce90fd704436cc9e5391c1f04827293511e
116 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV with the signature Pdf.Exploit.Dropped-78, indicating it exploits a known vulnerability. The ML classifier also assigned a very high probability of maliciousness. The presence of an embedded script payload and an embedded file further supports the conclusion that this document is designed to execute arbitrary code upon opening.

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
c80dab935d5cadd5fb9265d00be011303173d581bd62928a2b26d861efd53ab2		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18850 bytes

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