Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a5f28ec3bb7adc…

MALICIOUS

PDF

42.5 KB
MD5: e0527ed3dbd9b3f16fdd61bb79a0c492 SHA-1: f77125f625c7f17d8825fbe676b99077fa268c07 SHA-256: 52a5f28ec3bb7adc5c5640d119eb2bc1987fcc03d7ab646f09f23e9d7c292d4e
188 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The file is a PDF document flagged by multiple heuristics as malicious, including ML classification and ClamAV detection (Pdf.Exploit.Agent-36830). It contains an embedded script payload and an embedded file, indicating it's designed to exploit vulnerabilities and deliver further malicious content. The embedded script appears to be obfuscated and attempts to reconstruct strings, but its exact function is unclear without further deobfuscation.

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
0f5de77de40fc2350601edea11698fd99375106e1778ef121fc876c3a534feee		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42763 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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