Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3757c65828578e5…

MALICIOUS

PDF

14.7 KB
MD5: 5b79871199fb89e4178daa2074e7d1da SHA-1: 7e66512160352168666f28fe44aa5658934161cf SHA-256: c3757c65828578e5451bcd4189ffd7bf2a8f565214875deef0314726c428f9fd
148 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File T1566.002 Phishing: Spearphishing Attachment

The PDF file contains an embedded script payload and triggers XFA form heuristics, indicating it's designed to exploit vulnerabilities. ClamAV detections further confirm its malicious nature. The embedded script is likely responsible for downloading and executing a second-stage payload, as suggested by the 'Pdf.Exploit.Dropped' and 'Pdf.Exploit.Agent' signatures.

Heuristics 5

  • ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • 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://www.xfa.org/schema/xfa-template/2.5/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00000329.bin
765c91706b31f1ebe4b2dad5b1840bda38e2be347ab61f4a9e6202d0c00d9f3c
pdf-embedded-script PDF raw stream script payload at offset 0x329 14346 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36809
Obfuscation or payload: unlikely