Malicious PDF — malware analysis report

Static analysis result for SHA-256 853db831a31e4b83…

MALICIOUS

PDF

79.1 KB
MD5: 14ef65168091809c2cb90b3ea638fd11 SHA-1: 193250cd64cebd8010fd17e2aa2a7981593627cf SHA-256: 853db831a31e4b83f15db9ad84027648647a7d85f23c7bb7af586cba3a6e397a
178 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious Attachment T1059.007 Command and Scripting Interpreter: JavaScript

The PDF utilizes XFA forms and contains an embedded script payload, flagged by multiple heuristics and ClamAV as malicious. The embedded artifact was detected by ClamAV as a JavaScript exploit. The presence of XFA and embedded scripts indicates an attempt to execute malicious code upon opening the document, likely to download and execute a second-stage payload.

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.
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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_0000023c.bin
6b7edae42a0a108dd73c19cd46c7d68516f5de8ba5f442c7a5ed4f6f4b6790ab		 pdf-embedded-script PDF raw stream script payload at offset 0x23C 80283 bytes
Detection
ClamAV: Js.Exploit.HTML-29
Obfuscation or payload: unlikely

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