Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c6d69b4c801e39…

MALICIOUS

PDF

19.4 KB
MD5: bb99e3c7456e36390f46ebc449ac36b2 SHA-1: cc95ab82ae664a0e3cb1bceb50c76b3515bad779 SHA-256: 27c6d69b4c801e39c562d8ebf3cf6e22d56cdae5bfa4a40ef9e0313b527b76dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1566.002 Phishing: Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection (Pdf.Exploit.Dropped-78) and a high ML score, indicating it contains an exploit. The presence of an embedded script payload and an embedded file further supports this. The document body content is not human-readable and appears to be obfuscated or malformed, suggesting it is not intended for direct user interaction but rather to trigger the exploit. The embedded URLs are related to XFA forms, which are sometimes used in PDF exploits.

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
882a054d395e12bd34cfecdab9d9b40d623103966c025f361b3f6f9fda16de21		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 19084 bytes

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