Malicious PDF — malware analysis report

Static analysis result for SHA-256 605f297629d54759…

MALICIOUS

PDF

42.4 KB
MD5: d7b720f3caba3d0abe819742bc73ad81 SHA-1: 40bfbaf955d0fbac564e47e8779cfd9faec8cb6e SHA-256: 605f297629d5475944f245a48775aca1f2d1c60a4d7a08863045e46fd8396640
176 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Exploit.Agent-36830. It contains embedded files and an XFA form, suggesting it is designed to exploit a client-side vulnerability for execution. The specific exploit mechanism is not detailed, but the presence of embedded artifacts points to a payload delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36830 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36830
  • 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 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 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/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
0a2224c4023b216235b61c3fc4dd17bbfac1ab23a545687f51b97604cf654712		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xD7 46 bytes
embedded_file_obj0009.bin
c57077c95498b6c7b3e5341c194a8bb2b6e6707b4589525f5998eada2e64e806		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 687 bytes
embedded_file_obj0010.bin
0fe7596619d7974f48bb0928a6efec8cf5bea691a6bfb71cb5fbc41c3ca73638		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x447 168 bytes
embedded_file_obj0011.bin
880d206e8ba68b8ecc1a63b109ea3a88b1e828ede8f360422be6ebb30f2a750a		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x53A 424 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x72D 190 bytes
embedded_file_obj0014.bin
935a8d6f1f169dd612a7e27f2e25c17af9209e800d7a9de6432e84b2c09df5cc		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x838 40643 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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