Malicious PDF — malware analysis report

Static analysis result for SHA-256 685b4123d241cc81…

MALICIOUS

PDF

82.6 KB
MD5: 79fad8248e286429dd7d5ddea305c540 SHA-1: 2aae1a9b3b0b263fe93002c98b4e44e740d0c943 SHA-256: 685b4123d241cc8181ad2f07b3cf74b66762a1090882a6f3df32cd7ed75eae4c
168 Risk Score

Malware Insights

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

The PDF utilizes XFA (XML Forms Architecture) and contains an embedded JavaScript payload. Heuristics indicate this script is malicious and likely responsible for executing an exploit. ClamAV detections further confirm its malicious nature. The embedded script's obfuscated nature prevents a detailed analysis of its specific actions, but its presence within an exploit-carrying PDF strongly suggests it's designed to download and execute a secondary 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.
  • 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_00000246.bin
9265664f94863cc0d288741f43d5c663731492c3f9f0765e934f4fab9f96c2f3		 pdf-embedded-script PDF raw stream script payload at offset 0x246 83837 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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