Malicious PDF — malware analysis report

Static analysis result for SHA-256 c523918f2b848277…

MALICIOUS

PDF

42.9 KB
MD5: 87566af7ad3e6eaf5f9bdf5e8b97f09b SHA-1: f22ce97ce01455fe4ab3cf34373bf83d30489aa7 SHA-256: c523918f2b84827715b6a323116d396590deff12b6d55733388f4836e705acae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded script content and triggered critical heuristics for PDF exploits and embedded script payloads. The ClamAV detection 'Pdf.Exploit.Agent-36830' strongly suggests a known exploit. The embedded script, though obfuscated, appears to be designed to download and execute a secondary payload, indicated by the heuristic 'PDF_EMBEDDED_SCRIPT_PAYLOAD'. The presence of XFA forms and embedded files are common characteristics of malicious PDFs.

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 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
dcca2a4dd778543eded957f9249883b59f48b1ab1f4649b6eb01b2743d2aa2c2		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43143 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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