PDF malware analysis — malicious · ca1382b811e440f0

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6

MD5: f8c6c728c3fb12520f35e33d3c4aad18 SHA-1: 7c6b427ec8725659d90d173d45ce16905265b56d SHA-256: ca1382b811e440f02e6328e9a6582c0ad7901c094929460b01ba703ef7d7de06

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 ClamAV and a machine learning classifier. The presence of XFA forms and AcroForm buttons with action triggers suggests an attempt to exploit PDF vulnerabilities. The ML classifier output of 0.999296 strongly indicates malicious intent. The embedded artifact 'stream_001_off000008ed.bin' likely contains the exploit code or 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.

Filename	Kind	Source	Size
`stream_001_off000008ed.bin` `0613477bf3d7511808f963ec4bf4ad374919d20bda6cb85de364caf981c86c29`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x8ED	1483 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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