Malicious PDF — malware analysis report

Static analysis result for SHA-256 4390983ab08ef3df…

MALICIOUS

PDF

42.5 KB
MD5: c80b7bbbfae8eddc1a927ac275e47135 SHA-1: f2fb1372be650b6d422f64076be209f65d365d1a SHA-256: 4390983ab08ef3dfee24819b2dec2b6e25bd9f16ac52fc04bd8dab18d03b84ae
186 Risk Score

Malware Insights

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

The PDF was flagged by multiple high-confidence heuristics, including ML classification and ClamAV detection, indicating it contains malicious content. The presence of an embedded script payload and an embedded file further supports its malicious nature. The embedded script appears to be obfuscated and attempts to reconstruct strings, likely for downloading and executing a second-stage payload, though the exact reconstruction is not fully decipherable from the provided excerpt.

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
03a856bf3cae7ec81315c4e8b9135bbc42ed31e017727b84b0127fe20850db2e		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42817 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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