Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a95d8364602730…

MALICIOUS

PDF

42.4 KB
MD5: fc4b7be0575e3f7d8a72a3cbdae345b1 SHA-1: 880c7927ed6413fd534ee90000f589110fdc04af SHA-256: 53a95d836460273057cdc13ee816bade1e2a694402ce67729968323da365c766
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including critical ClamAV detections for 'Pdf.Exploit.Agent-36830', indicating it contains an exploit. An embedded script payload was also identified. The ML classifier assigned a very high probability of maliciousness. The embedded file artifact is the most direct IOC.

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
d2b15113efd50f409e8d2655b7f86917b7342b365c0dc9d98738aed631de32f4		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42704 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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