Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81902bd4b09185e…

MALICIOUS

PDF

42.6 KB
MD5: b5c4d8521bd4fcb1cd8a061eb3012e4f SHA-1: 57800b0c8a962d38517f992ebf96557b8ea54eb2 SHA-256: a81902bd4b09185ed061207236faeb070b734d3a707a2bb1dabfcc45c2ce5195
186 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious. It contains embedded files and scripts, indicating it's designed to exploit vulnerabilities. ClamAV detection of 'Pdf.Exploit.Agent-36830' strongly suggests it's a known exploit delivery mechanism.

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/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
0a2224c4023b216235b61c3fc4dd17bbfac1ab23a545687f51b97604cf654712		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 46 bytes
embedded_file_obj0009.bin
d13a6f1dc61deac6417145ca41699e72584d4e3f10946fd77da104553d008e17		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x13C 687 bytes
embedded_file_obj0010.bin
8259db878f85521b2ee9c7ec108d34b19d3b6c900af7d501b5135c2cd3dcfde6		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x436 168 bytes
embedded_file_obj0011.bin
d04c47efc1a64c7aba522d2cb10121dd29e395bd7ee81533bde19d3abb311724		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x529 444 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x730 190 bytes
embedded_file_obj0014.bin
9ef58062998ee2c215ac80103c242db1afd533f15e6c7f8d49e5284bd4e46053		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x83B 40781 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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