Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a9ff261723d82d…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: bf3dce7c663e085890a4d8ae13bf4545 SHA-1: 14e0c81e82f9f4945aa8eae491b54dc9be9d8438 SHA-256: a8a9ff261723d82dadfc97c6fa755195afdbfb6bd9c0058f2402d9e3bc7e2d5b
108 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classification and ClamAV, with the ClamAV signature indicating it's an exploit agent. The presence of XFA forms and AcroForm buttons suggests an attempt to trigger an exploit. While no specific script was extracted, the overall structure and heuristic firings strongly indicate a malicious PDF designed to exploit vulnerabilities, likely leading to the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-36874 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36874
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_001_off000008ed.bin
9f570a8580a04211d1cc271df8b54663afa6f08ca0102cb9b07c560c3fb34178
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1448 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).