Malicious PDF — malware analysis report

Static analysis result for SHA-256 57966e14e41f12f8…

MALICIOUS

PDF

42.7 KB
MD5: b5d6236e4dc50d57cc0d485511f23734 SHA-1: ef7afb572c5f70aa98cd3be9a8a3c6dc17465a8e SHA-256: 57966e14e41f12f858694def7b57e32847abaa68a571710a634691420857db4e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating it contains malicious content. The presence of embedded files and scripts suggests it's designed to exploit vulnerabilities and deliver a secondary payload. The ClamAV detection name 'Pdf.Exploit.Agent-36834' strongly points to a known exploit targeting PDF viewers.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36834 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36834
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
04462f810d6eacdacecc9d0a5f3f81bebc722af4415e04da19b520338f642b51		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xD7 67 bytes
embedded_file_obj0009.bin
84f725bd6015d62ef1b563c521943f81b591c26beba5c02cbd5125f317bb433d		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 686 bytes
embedded_file_obj0010.bin
1870a8c90be73ebe36ae508f57c55ef58407515a4ad8c7e867914369cf2923c9		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x45B 99 bytes
embedded_file_obj0011.bin
cf85fa242ced821f7163d13802638c8fafd80d2284fa4b3f1a86b1e720feb722		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x509 576 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x794 190 bytes
embedded_file_obj0014.bin
08dcd5ea6bc7f6ddaf1b7dcdad2e8baf7d357e71ae77a723e27529621523d7aa		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x89F 40753 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36834
Obfuscation or payload: unlikely
embedded_file_obj0015.bin
78b09463af5cd373870eae2e3e83de87b7f6b659e0d0117ab4c09d90ebb2ad95		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xA81A 68 bytes

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