PDF malware analysis — malicious · 21cb5cbbad72583e

MALICIOUS

PDF

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

MD5: 25fdbc80992ca8b76f7b2695aac49e26 SHA-1: 76e73105e530b93be583744ee389d99f74ee8900 SHA-256: 21cb5cbbad72583e0bb5246f31fdaccf9a559d61f6493f9ac028b3573192145d

110 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically identifying it as 'Pdf.Exploit.Agent-36874'. The presence of an XFA form and an AcroForm button with an action trigger suggests an attempt to exploit a PDF vulnerability. The embedded artifact 'stream_001_off000008ed.bin' likely contains the malicious 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` `ba4a99af8dd33d3a59064cf98782418c182e49bc9dafffeb13c3f192d96739b1`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x8ED	1439 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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