Malicious PDF — malware analysis report

Static analysis result for SHA-256 747ff2b6190c562c…

MALICIOUS

PDF

9.9 KB Authoring application: Uswrgalir Chgrvskxphymrp
MD5: 153e8b6f731ab07169c46ca36d776510 SHA-1: 6783d5b114240c168a2f708a6bcf0dbf1061d545 SHA-256: 747ff2b6190c562c5b38fd9da636127ba3eba9c66d5a9feb5a1c5fed2c049170
118 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript and an embedded file, strongly indicating it's designed to exploit vulnerabilities and download further malicious content. The ML classifier and ClamAV detection confirm its malicious nature. The embedded script likely attempts to download and execute a second-stage payload from the unknown URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Dropped-85 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-85
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://www1.personal-pyholder.it.cx/?k5o8o=j5jcnKzV3deZ5NfFqWWgrpiV4NjRr6RmoG2fpJWipaHTh%2BCgraqbopybm6KhbaFe2%2BOio6OfpYfNj9LrpcK5qIvi1Jmsa5XjiQ%3D%3D&quot
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
b6a9ee08cf9c270e56a18bee6681edbe4ff02d8ce470a1a7965a52cbe0c483cb		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x341 9083 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 long base64-like blob(s).

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