Malicious PDF — malware analysis report

Static analysis result for SHA-256 b831b6688a53fbe9…

MALICIOUS

PDF

19.1 KB
MD5: 8cca2818f858050d6f17538380c28c51 SHA-1: a6ef07df56459851609c28860ba7987e2c68d35d SHA-256: b831b6688a53fbe98df8b1f3380c14c44a8353f91e67c2fa32bd9b762cab99c0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV with the signature Pdf.Exploit.Dropped-78. It contains an embedded script payload and an embedded file, indicating it is designed to drop and execute further malicious content. The XFA form structure and embedded file suggest a common technique for exploiting PDF vulnerabilities.

Heuristics 5

  • ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • Embedded script payload in PDF stream medium 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 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 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
d37189172e266fb3944322d65b1f910a8ade4fc795c1d38185fd8e5b1dfc09e9
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18814 bytes