Malicious PDF — malware analysis report

Static analysis result for SHA-256 752ac1b0147f4a56…

MALICIOUS

PDF

42.3 KB
MD5: 6ed868d08d5e81555a13da784c765360 SHA-1: 75a4139d0056721dca22d0b533010b9676d168eb SHA-256: 752ac1b0147f4a565cf0e165ce1e0cfdeeb57d02eb0b1d2855ae1177a0c1f912
176 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Exploit.Agent-36830, indicating it contains an exploit. The presence of an embedded script payload and an embedded file further supports its malicious nature. The ML classifier also strongly indicated maliciousness. The primary IOC is the ClamAV detection name, which often correlates to a specific exploit or dropper.

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/xci/1.0/
    • 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
6b4d3fc010202869c8c3dfa12c295b1cc57a907b34bbb2a0b4ed15c5a284e401		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42580 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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