PDF malware analysis — malicious · 40ebd8ecbcaa296c

MALICIOUS

PDF

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

MD5: a47dd52e20b22b328ea6e6f963c515b1 SHA-1: 3babbe2e18a66fb808d82de306c5519c67f61051 SHA-256: 40ebd8ecbcaa296c1282b67f3f9f7a6f42c14de2794b3fccb4980a8b09ab3a74

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 (Pdf.Exploit.Agent-36874) and a machine learning classifier. The presence of an XFA form and an AcroForm button with an action trigger suggests an attempt to exploit PDF vulnerabilities. The ML classifier's high confidence score further supports its malicious nature. The decompressed PDF stream 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.

Filename	Kind	Source	Size
`stream_001_off000008ed.bin` `6c55db6f377e822d0fdeaffcaffac21646e6d7dc8ee8f4d59f106014f98c6409`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x8ED	1434 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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