Malicious PDF — malware analysis report

Static analysis result for SHA-256 158018fb1cecd964…

MALICIOUS

PDF

79.3 KB
MD5: 75690a4713f859b4d3c1820a389e3bd9 SHA-1: 934b6a37439ba7a41b376074388b2d5b1472978f SHA-256: 158018fb1cecd9648c16554fb382dec36aadd7e33eeff9b0839bf02c846f5b17
168 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, as indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic and the script content. The script appears to be obfuscated and attempts to download and execute a secondary payload, which is a common technique for malware delivery. ClamAV detections further confirm the malicious nature of the file. The presence of XFA form elements also points to potential exploitability.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • 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.
  • 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_pdf_script_0000023e.bin
8c7b34d2060b409c5570ccfb8e8ba0a3ede6239bc5e896937fb1d2fe70553981		 pdf-embedded-script PDF raw stream script payload at offset 0x23E 80471 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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