Malicious PDF — malware analysis report

Static analysis result for SHA-256 856e0857bdbea555…

MALICIOUS

PDF

12.1 KB
MD5: ee3142b7fbae25ce86c0ff5b41b8a394 SHA-1: c3f09cfe770c9f79063615a16f4cb59b5560d21d SHA-256: 856e0857bdbea555dbfc5751cd586900ce38c9beeda89304d45a6c4e01638910
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier, indicating it's likely an exploit document. The presence of an embedded script payload and an embedded file further supports this. While the specific exploit or payload is not detailed, the overall pattern suggests an attempt to leverage PDF vulnerabilities for malicious purposes.

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
4c938b872c2ef6bd14087e52a7996d55d5f472676028debc90c71f6a3a0fa33b
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 11683 bytes