Malicious PDF — malware analysis report

Static analysis result for SHA-256 605e46de606efbac…

MALICIOUS

PDF

42.2 KB
MD5: b26bce470808d2ae1b48cfb98059dcc3 SHA-1: 5b432d3b4e9919345f16d3d0703915012c8448c9 SHA-256: 605e46de606efbacf8e47a365fc59d1647443832c520cdf68b314c8f10d18047
176 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and ClamAV as malicious, specifically identifying it as an exploit. The presence of an embedded script payload and the ML classifier's high confidence score indicate that the document is designed to exploit a vulnerability in PDF viewers to execute arbitrary code. The benign URLs present are likely decoys or standard PDF schema references.

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
e0453c83ce0b6a86632cdd754b1969a26c6afbc4976b2e857dd1e7f5c73d639d		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42456 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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