PDF malware analysis — malicious · 5576b3bb4dfeacc5

MALICIOUS

PDF

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

MD5: d4e38a91800209e133e04c94b41d0140 SHA-1: 9f10eebb5ef8a5912384422f7b2adc041fe15525 SHA-256: 5576b3bb4dfeacc5826d26c378401886e043f3268338ef9b6828a4e788815ed9

108 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically identified as Pdf.Exploit.Agent-36874. Static analysis indicates the presence of XFA forms and AcroForm buttons with action triggers, suggesting an exploit is embedded within the PDF structure. The ML classifier output of 0.999296 strongly supports the malicious verdict.

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` `30703b639f835f787b964fe9fb360415e5edd6a98e2e7c09ecbfba8469dd06c0`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x8ED	1435 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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