Malicious PDF — malware analysis report

Static analysis result for SHA-256 820f307aa47ef4ee…

MALICIOUS

PDF

43.4 KB
MD5: 4539663a99417ed334dfc2adc48ad182 SHA-1: a6dd462441d2d3f10da395fb1cebf1afcba7b4d7 SHA-256: 820f307aa47ef4ee3041bb100e1e436b31e13b2310a5f427c044e44bdb072d6c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF file contains embedded scripts within an XFA form, a known vector for exploiting vulnerabilities. The critical heuristic firings for PDF_XFA_SCRIPT and CLAMAV_DETECTION, along with the ClamAV signature 'Pdf.Exploit.Agent-36830', strongly indicate malicious intent. The embedded scripts are likely responsible for downloading and executing a second-stage payload, although the exact script content is obfuscated. The presence of multiple embedded files further supports the payload delivery mechanism.

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-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 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
0a2224c4023b216235b61c3fc4dd17bbfac1ab23a545687f51b97604cf654712		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xD7 46 bytes
embedded_file_obj0009.bin
183a7c74bfdc8304a4bed76d45e68cedfeb41e4c86d1f6e00bacb58a6dbdcc5d		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 687 bytes
embedded_file_obj0010.bin
b9dc770324ae2a66fd1d9c8b9605e3a9ddaae9d1311dffe002d37a59fdc6e4bc		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x447 183 bytes
embedded_file_obj0011.bin
ba6bc07f09e0d325ebb073e09083fbf953c9133637251b2a6b38d0d15c074691		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x549 353 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6F5 190 bytes
embedded_file_obj0014.bin
d0cfd0200d361b51fedc64a217fc31f583a3fc343533056d06cdb41a6aa348e5		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x800 41635 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely
embedded_file_obj0015.bin
78b09463af5cd373870eae2e3e83de87b7f6b659e0d0117ab4c09d90ebb2ad95		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xAAED 68 bytes

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