Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f5c8d1dee617f4…

MALICIOUS

PDF

42.5 KB
MD5: 9b65918f1b4c390d936d8aaf08a05b97 SHA-1: 1a74459d1588222d5a638d3fdb2e401a39211bea SHA-256: b1f5c8d1dee617f4ee6b4c631a8c7ff61fc8ff467e745192388dd7db73a44dec
226 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded XFA forms with executable scripts, flagged by multiple high-severity heuristics. ClamAV detection confirms this as a malicious PDF exploit (Pdf.Exploit.Agent-36836). The embedded script payload is likely responsible for downloading and executing a second-stage payload, a common technique for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • ClamAV: Pdf.Exploit.Agent-36836 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36836
  • 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://ns.adobe.com/xtd/
    • 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
e2225cee13ca18c4f3cb47dcc1c3e92615b9c9d0574a4971cea51bf3ab93acb6		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 676 bytes
embedded_file_obj0010.bin
be34a2470f2b5e7f4185726d987323dfdad1f57455c61b338e56b1b939569cb8		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x451 116 bytes
embedded_file_obj0011.bin
d15ce096368a0af4fe0cf6b476614acc209cf3990cd3f57eb980e07a9edab509		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x510 361 bytes
embedded_file_obj0012.bin
6dfc2cfc739bf5cd5514e048143c782a1af7b4c86ed10bd88203471efa9b3fe7		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6C4 389 bytes
embedded_file_obj0014.bin
03fa25a126d470741d85d5d9ae999d39ca47a6c3ae21c660b8613e9a2caec9d0		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x896 40505 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36836
Obfuscation or payload: unlikely
embedded_file_obj0015.bin
51d6d76eddb1746e412f89f4d1c1b0d620c60fb4a5641c018e93871be63968a9		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xA719 147 bytes

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