Malicious PDF — malware analysis report

Static analysis result for SHA-256 163ce8ef79681608…

MALICIOUS

PDF

42.7 KB
MD5: 838b7ae0139d4e214b46468eff21d5b4 SHA-1: da701548f2f6e0c74910956145487c2a81eb1bb3 SHA-256: 163ce8ef79681608fde07f6324d3bb3989834b8d1540c41e99ba69899b0aab8b
176 Risk Score

Malware Insights

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

The PDF sample contains embedded JavaScript, indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic and the 'ML_NYX_PDF_MALICIOUS' classification. The embedded script, though obfuscated, is likely designed to exploit a vulnerability within the PDF reader to execute code. ClamAV detection of 'Pdf.Exploit.Agent-36830' further confirms its malicious nature. The benign URLs related to Adobe and XFA schemas do not appear to be directly involved in the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36830 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36830
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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
8fd1cf75d52f6bd0c94e1fe08213874c5451870285022392417276ba3f659a84		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42969 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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