Malicious PDF — malware analysis report

Static analysis result for SHA-256 1315be7d26a6cfcd…

MALICIOUS

PDF

100.5 KB
MD5: 0e1293e1dadee958a87b9271a4ef6f77 SHA-1: 56de81654a8e3878c650d270096dd3e574310e5f SHA-256: 1315be7d26a6cfcd01351f870080f36c7155ab27d2a5ce5e047d9a5bce4a4ccd
168 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as malicious and a machine learning classifier with high confidence. It contains an embedded JavaScript payload within an XFA form, which is a known technique for exploiting PDF vulnerabilities. The script is heavily obfuscated but appears to be designed to download and execute a secondary payload, indicated by the `loadXML` and `grebgt634ts` checks and the string concatenation for script content.

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
a3e114184785207f2024324b5cb4a726d0f1e0cf418137a862bfd62bec1d473e		 pdf-embedded-script PDF raw stream script payload at offset 0x246 102154 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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