Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ab5c76719f2496…

MALICIOUS

PDF

42.9 KB
MD5: 12cdafb68d4c933f9a0f0b3d671780df SHA-1: 0b699edce9e0af55575c44d09f46847d33751bc9 SHA-256: c5ab5c76719f2496dfc5ab9b0adbe4c6578813c10bd52094c2aa39796f54a46e
186 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious, specifically flagging it as an exploit. The PDF contains an embedded script payload and an embedded file, which are common delivery mechanisms for malware. The embedded script is heavily obfuscated, making its exact function difficult to determine, but its presence alongside the embedded file suggests it is responsible for executing or unpacking the payload.

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 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
987c873774b5133861305d9344dbad7a0d02d181609dbdcf9ed2caf52e7a8982		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43196 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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