Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcc596e56a45cce…

MALICIOUS

PDF

79.3 KB
MD5: 6510f49e1791219f08a945a6a6fe5948 SHA-1: aa2edc7937432f5b9d0b5af905997568dc18e854 SHA-256: 5bcc596e56a45cce12ef84dec5a8c1eff0f687703b2cae9bf08937ccbc58b6fe
168 Risk Score

Malware Insights

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

The PDF was flagged as malicious by ML classifiers and ClamAV, specifically detecting an XFA form with an embedded script. The embedded JavaScript is heavily obfuscated but appears to be designed to download and execute a secondary payload. The presence of XFA and embedded scripts points to a common technique for delivering malware via malicious documents.

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_0000023e.bin
ce2c738e1c2275f82cc669e92d894ec5e0d6c2b243f885afa4b0649af2481ef3		 pdf-embedded-script PDF raw stream script payload at offset 0x23E 80469 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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