Malicious PDF — malware analysis report

Static analysis result for SHA-256 31608054760a89e9…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: c0ca4ec4ef659dedc84029c0cb835cd7 SHA-1: 40998e77e1ac25cad8ffc611421be5c0e3ffb32f SHA-256: 31608054760a89e97843e0c952cced681a5f32594428a7ed95724efc87bf6ba9
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 both a machine learning classifier and ClamAV, specifically flagged as 'Pdf.Exploit.Agent-36874'. The presence of XFA forms and AcroForm buttons with action triggers suggests an attempt to leverage PDF features for exploitation. The ML classifier's high output score further supports the malicious nature. The embedded artifact 'stream_001_off000008ed.bin' likely contains the exploit code.

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
451e1612d095fbbd18c63f181c992f9f6e674dc3d05ca41c2ee9c2f7f8140993
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1473 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).