Malicious PDF — malware analysis report

Static analysis result for SHA-256 63706dc99589765b…

MALICIOUS

PDF

42.6 KB
MD5: d53520463285e30572c42c048df2cc7e SHA-1: b38be740341cf3971e4f6b0b7ef57d4bf8c2a3c6 SHA-256: 63706dc99589765bbb165671ffc8a4d6a45b380a2d7506243f79b12053045573
176 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection (Pdf.Exploit.Agent-36830) and a high ML score. The presence of PDF_XFA and PDF_EMBEDDED_SCRIPT_PAYLOAD indicates that the PDF is designed to exploit vulnerabilities, likely for client execution. The embedded artifact, also detected by ClamAV, further supports its malicious nature. The benign URLs do not detract from the overall malicious assessment.

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
53585af4009109fcf512f88fe2bb299a8eb0a4bce0686147aa28bcf7f64dc199		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42860 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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