Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b8fbf4db727344…

MALICIOUS

PDF

12.0 KB
MD5: 114e9af3541cb013603d01efdec28e70 SHA-1: 410c5dc79405b2dfa87b6b46f751a89a74e38641 SHA-256: d8b8fbf4db727344923e61ba502fe34d667739925c67c3412145bfc210d7fd17
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ML classification and ClamAV detection as 'Pdf.Exploit.Dropped-78', indicating it contains an embedded exploit. The presence of an embedded file and script payload further supports this. The document body content is obfuscated and does not provide clear user-facing lures, but the technical indicators strongly suggest a malicious exploit delivery mechanism.

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
f61623e4046b92f8ca02b7ef98215d3b608f980969e181e176b6433682c9c629
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 11555 bytes