Malicious PDF — malware analysis report

Static analysis result for SHA-256 607ec9f53e3aa873…

MALICIOUS

PDF

42.8 KB
MD5: 79d5cdd5b6a0d2f8e2a5faa5fbae8652 SHA-1: 73e719fc641d7e8debe5d5adc01b7e4de771b04b SHA-256: 607ec9f53e3aa873eee9adba31fcefa6282445e96037b87b02e41c31e6abb44e
176 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as Pdf.Exploit.Agent-36830. It contains embedded script content and an embedded file, indicating it's designed to execute malicious code upon opening. The presence of XFA forms and embedded scripts suggests an exploit targeting PDF reader vulnerabilities for initial execution, likely delivered via spearphishing.

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
34a8f750dbdc9edfb8e04db67be9b3afa5cb292453bbafd1137a33b7dba689e3		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43023 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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