Malicious PDF — malware analysis report

Static analysis result for SHA-256 169a123e8a76f3a2…

MALICIOUS

PDF

11.4 KB
MD5: 8bbda07658bc70e93e2cb0f50fd46f48 SHA-1: cb8f31a1456618a3b512ac0646fa8d64134ce865 SHA-256: 169a123e8a76f3a2200353d3746f83819993d4f47c65078c821a26c97c00f542
116 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic and the presence of an embedded artifact. This script is likely designed to exploit a vulnerability within the PDF viewer, leading to the execution of malicious code. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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 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 script payload in PDF stream low 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 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
ddbacc85724e6ff6440ea0f8e9bd3d24370746345ba1ff6f2c178e85a6e9b09a		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 10913 bytes

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