Malicious PDF — malware analysis report

Static analysis result for SHA-256 646e548ef2605944…

MALICIOUS

PDF

11.8 KB
MD5: 0a1bdee5f264a6d89de02d201e06ac3a SHA-1: 3f46d69af7618f03d2c81730542b9c769c0a4938 SHA-256: 646e548ef2605944cde53c487461f766ec2fde18d7fad8d8227067d0b41855e8
116 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Exploit.Dropped-78 and a machine learning classifier with high confidence. It contains an embedded script payload and an embedded file, indicating it is designed to exploit vulnerabilities and download a secondary payload. The embedded file name 'embedded_file_obj0008.bin' is the primary IOC.

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
853e0f1940238431520debb88d2c26fa15203b896346d5ffd1ad2964888921c8		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11340 bytes

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