Malicious PDF — malware analysis report

Static analysis result for SHA-256 310e9e46ccb67483…

MALICIOUS

PDF

26.5 KB
MD5: b99571d68c3cc6b07711c78cc30be2e8 SHA-1: aeee9c968e04989ed537cdaf23f30e70f7daaa22 SHA-256: 310e9e46ccb674832bf63a7984f1c84b66f7c18073b9ada2163a3a5b3279a788
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, indicating malicious intent. The presence of an embedded script payload and an embedded file suggests the document is designed to download and execute a secondary payload. The specific ClamAV detection name 'Pdf.Exploit.Dropped-78' further supports this. No document body text was available for analysis.

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
f5bf03d8de6657d515604e8b46b30a6b43df7b6a591ad1f02d942ceef33eeb7b
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 26344 bytes