Malicious PDF — malware analysis report

Static analysis result for SHA-256 2579b74b8c4b6619…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: aa2063a00e72942f3c2c9338cc14d267 SHA-1: 7d6999513810958b807c6022c8bf696659f21761 SHA-256: 2579b74b8c4b661979079f9586f66eb42057fad0476e2d498029478d252a14f3
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The file was detected by ClamAV as Pdf.Exploit.Agent-36874, and an ML classifier assigned a high probability of maliciousness. The presence of an XFA form and an AcroForm button with an action trigger are common indicators of PDF-based exploits. While no scripts were extracted, the file's structure and heuristic firings strongly suggest it is designed to exploit a vulnerability to execute arbitrary code, likely downloading a second-stage 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
4705576fc57b3eeccaa9369f51651e0cdf8d2d2148a761486305e4b3698641a1
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1464 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).