Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba72ac3246bf811…

MALICIOUS

PDF

74.1 KB
MD5: 1b9c7bdbe976b03453d1cf9636372835 SHA-1: 662a4f2f9fe5de21a537237ba801efde7ca08dd1 SHA-256: 0ba72ac3246bf8118583d73e395c415feb23358186ef5d6030e382be33b0482e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic and the presence of script content. This script is designed to download and execute a secondary payload, as suggested by the 'Pdf.Exploit.Dropped-93' ClamAV detection. The script's obfuscated nature and the use of JavaScript point towards an exploit targeting PDF viewers, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Exploit.Dropped-93 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-93
  • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_0000037d.bin
ad0ccfb177276b745e6b31fea0232c60f4791af729b8d829c23876c736d09bd2		 pdf-embedded-script PDF decompressed stream script payload at offset 0x37D 63820 bytes
Detection
ClamAV: Pdf.Exploit.Dropped-93
Obfuscation or payload: unlikely

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