PDF malware analysis — malicious · cb7f35db9f69b2b7

MALICIOUS

PDF

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

MD5: a97675fade00473f3bed48d8960da03c SHA-1: f0de35e8428b899f5e3aa359184f8a6baacccfd0 SHA-256: cb7f35db9f69b2b7c31b47c0e2c590aab795d6c16718d5688bb60fc6937a5df1

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious Attachment

The file is identified as a malicious PDF by ClamAV and a machine learning classifier. The presence of XFA forms and an AcroForm button with an action trigger suggests an attempt to exploit PDF vulnerabilities. The ML classifier output of 0.999296 strongly indicates malicious intent, likely for delivering a second-stage 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` `03542ff172b8c552ef0c97d153a853bcafbacf14979342fd2888a560bb1d85ad`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x8ED	1453 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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