Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cefab4a28d8c483…

MALICIOUS

PDF

11.5 KB
MD5: dbf317c5588c01280061982a478d373d SHA-1: 5c54e7149f2c0426343eb41e912e54564730f95c SHA-256: 5cefab4a28d8c483810a740ac2ad6b4fc3b39f0b2ae8a500301950acf08dfb1a
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 further malicious content. The benign Adobe and XFA URLs do not appear to be malicious.

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
72d1d2a25968767c802a99f7710670fa457c6d74cd38cebdf2a60065389b0e82		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11000 bytes

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