PDF malware analysis — malicious · b1543cd42d03a93b

MALICIOUS

PDF

9.6 KB Created: 2011-03-02 05:55:48 Authoring application: FPDF 1.6

MD5: 2c4ec446f9046b693b6c0f27057663b9 SHA-1: 8d179cfd0f7d4e264739e6f6dab0fa3012e95634 SHA-256: b1543cd42d03a93b143737d91540b08efffe027219136a59463f80e83222e743

130 Risk Score

Malware Insights

MITRE ATT&CK

T1566.003 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious PDF

The critical ClamAV detection and high ML classifier score strongly indicate malicious intent. The presence of XFA forms and JBIG2 decoding filters are common in exploit-laden PDFs. The ML classifier output of 0.997562 further supports the malicious classification. The embedded artifacts suggest the PDF contains exploit code designed to compromise the viewer.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

Heuristics 5

ClamAV: Pdf.Exploit.Agent-36859 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36859
JBIG2Decode filter medium PDF_JBIG2

JBIG2 image decoder present — historically used in zero-click exploits
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_006_off00001615.bin` `5744e03c91a65e0191f1fd043f4d9e2ce96e8e489a65aa242bb39806be5c1de3`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1615	746 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`jbig2_00_off0000189d.bin` `f3e563864ee34901cf41a08c7090a8df0f0a84ff1f296e0a1e11ab6df3ad405e`	pdf-jbig2-stream	PDF JBIG2 stream (Flate-decoded) at offset 0x189D	3125 bytes

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