Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b0976caa867da4…

MALICIOUS

PDF

42.8 KB
MD5: 8e927ecdd1192a903a705dd630a467bf SHA-1: 5682f2528f06c0f0c5c0d71d5bbcfd021110bfa3 SHA-256: b8b0976caa867da49cd8225d0c769b147e53b08ef966cf6be2f4039721b92573
156 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution

The file is a PDF containing an embedded script payload, as indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic. ClamAV detections confirm this, identifying it as Pdf.Exploit.Agent-36830. The embedded script is likely responsible for exploiting a vulnerability within the PDF reader to download and execute a secondary payload, although the script itself is heavily obfuscated.

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 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/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_file_obj0008.bin
9b3a0113e86515b36484a0d9596a198dc4adc5819f645fc8ec061c3eb15531d6		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43050 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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