PDF malware analysis — malicious · 4d17375aa2639e71

MALICIOUS

PDF

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

MD5: b33b36d18a5dc9030c72e73357c4f098 SHA-1: 6147cf92e792ccbef1d0e5e80f0b57374e7621c7 SHA-256: 4d17375aa2639e71dfe371c61f114ddabf4a19048adc395f448333c6ab5a522b

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious File

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as Pdf.Exploit.Agent-36874. The presence of XFA forms and AcroForm buttons suggests an attempt to exploit PDF viewer vulnerabilities. The ML classifier output of 0.999296 indicates a very high likelihood of malicious intent.

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` `b7ffa04b66c4a26a92f61a40b994371476ef8f6d47d6ed665a2f798a48b635dc`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x8ED	1436 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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