Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdfaa2d4ce8ff71…

MALICIOUS

PDF

19.4 KB
MD5: 3554d3e91ecc27b575166640aea14314 SHA-1: b189dba3ba55bb92a1911c1c508a681330e59db9 SHA-256: 9fdfaa2d4ce8ff718dd2e8778151b99f8b0122e47628a5cb8404eaf68cc57b43
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV (Pdf.Exploit.Dropped-78) and a machine learning classifier. Heuristics indicate the presence of an embedded script payload and an embedded file, suggesting it's designed to exploit PDF vulnerabilities and drop further malicious content. The XFA form structure also points towards potential exploitability.

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 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
fa107adf7f878377d4bacdd0ac75fb3d9daeab02a74d473df598c0a4bc2c45c6
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 19061 bytes