Malicious PDF — malware analysis report

Static analysis result for SHA-256 764b98ab671eeada…

MALICIOUS

PDF

94.1 KB
MD5: a91983c87b6ff6d3c5d2e18ab1ed795a SHA-1: 177a63e987a834814ff63c29a4d00aa7433c6b5d SHA-256: 764b98ab671eeada95baeccbc2911f4586443cf8f1b545b4e31526056c877b6d
168 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple engines, including ClamAV, and exhibits characteristics of an exploit. The presence of an XFA form and an embedded JavaScript payload suggests an attempt to execute malicious code upon opening. The script appears to be obfuscated and truncated, but its intent is likely to download and execute a second-stage payload, aligning with common exploit delivery techniques.

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
9f863b36b0efd701708ca79357fea7f7eb23a27fa88089e231079a9d1514bccb		 pdf-embedded-script PDF raw stream script payload at offset 0x246 95638 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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