PDF malware analysis — malicious · bb99e723f1792a1a

MALICIOUS

PDF

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

MD5: f3438d7256c47b355571a8a609e313d2 SHA-1: 18c42f2f8f2246138ae12f1bd19eed3478f37264 SHA-256: bb99e723f1792a1a29de64bfb7b621f777b011b728da8ed6a8ea3a2e625db59e

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: User Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as Pdf.Exploit.Agent-36874. The presence of XFA forms and AcroForm buttons with action triggers suggests an attempt to exploit PDF vulnerabilities. No scripts were extracted, but the ML classifier's high confidence indicates a likely exploit delivery mechanism.

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` `1131ecabf9169db75259396195a327b49d859d3896f4c248335f1ac968d02554`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x8ED	1432 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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