Malicious PDF — malware analysis report

Static analysis result for SHA-256 c916c15e0eb8e0a5…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: e4e287ba6603808517fb9d7a7addc40f SHA-1: e2f2034a0a6c80331167c62aebc26f33b1855255 SHA-256: c916c15e0eb8e0a50915cd941b88b7584dfe751d8ef65c0b9dac119881ece4fd
110 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Agent-36874' and a high ML classifier score. The presence of an XFA form and an AcroForm button with an action trigger suggests an attempt to exploit PDF vulnerabilities. The ML classifier's high confidence score further supports the malicious nature of the document. The SHA256 hash is included as a primary IOC.

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
4dd2d9bc133af306261986baaca993b90ac287b7e3c091b0573b7cf7d9ffe486
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1490 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).