Malicious PDF — malware analysis report

Static analysis result for SHA-256 3526ebd254495ebc…

MALICIOUS

PDF

9.9 KB Authoring application: Uswrgalir Chgrvskxphymrp
MD5: 2063728b219bd050fab103e0f717ad20 SHA-1: ba01a7a88f8a581de7ef856c4968facc909a494c SHA-256: 3526ebd254495ebc8cbf4ea37167595feddf7577fbc426e2b4adbaa57c90ea83
130 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution

The PDF sample was flagged by multiple heuristics, including ML classification and ClamAV detection, indicating malicious intent. The 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'EXTRACTED_FILE_STATIC_TRIAGE' heuristics suggest the presence of an embedded script or payload within the PDF stream. The embedded URL is likely used to download a second-stage payload. The ML classifier's high confidence score further supports this assessment.

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 script payload in PDF stream medium 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 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
  • 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://www2.topvnmaster.de.lv/?v8h7sy2=mpvVm7DeqtmV5d%2FSqpaqpJ2Y6qzUdKiqZKnQpNue0pKjmtnls2mbaqOvaKqooqyU2dSwpZWirV7JmdXrb8bDu5ze1sWwp4vlmg%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
31b9241c7e0f01b6ae317f9077dea1bedf79ebb7152a34683da268b9177cb6c1		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x341 9077 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 long base64-like blob(s).

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