Malicious PDF — malware analysis report

Static analysis result for SHA-256 897b3f72e7d10c9f…

MALICIOUS

PDF

12.6 KB
MD5: 39080212cc749bb1fc02cbf71d16abec SHA-1: 7b886cc4d42e02a4d22ab84ac26750e898409e2e SHA-256: 897b3f72e7d10c9f6f8524e4968e4ab5b4802c7e369a2cd29f4ef0b71ca26a69
126 Risk Score

Malware Insights

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

The file is a PDF document 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 deliver a secondary malicious component. The presence of XFA form elements and embedded scripts suggests a common delivery vector for exploits targeting PDF viewers.

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
4ceb737b3bad5ef5fc8223039c7fdead4270fc172b2f0e340e1908c0a899a3f4
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 12121 bytes