Malicious PDF — malware analysis report

Static analysis result for SHA-256 a544f1dc06068727…

MALICIOUS

PDF

11.8 KB
MD5: b86b378a2c7325f6aa9735f85fc05333 SHA-1: 8008591d69bcd69cd1bc6fe4deadcbd934efbbef SHA-256: a544f1dc06068727bada77fae2f770daa9678430facc358143c6b2f6dc04fc43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File T1566.002 Phishing: Spearphishing Attachment

The file is identified as a malicious PDF by multiple high-confidence heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Dropped-78' and an ML classifier outputting 0.999995. The presence of an embedded script payload and an embedded file further indicates malicious intent. While specific URLs were extracted, they were all confirmed as benign or unknown, suggesting the primary malicious activity relies on exploiting PDF vulnerabilities rather than direct URL interaction for initial delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • 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
60719a94b3bd0f4a83bad47f296fcb22b68926b58c33cd2bde2f9af225008fa8		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11292 bytes

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