PDF malware analysis — malicious · 8c780bf7545d9e3d

MALICIOUS

PDF

12.0 KB

MD5: 2af7276f1e24712fad68c40262caeb20 SHA-1: 52f5d071756214dc1b6e5812e7a07bdeeae2d75f SHA-256: 8c780bf7545d9e3dde2803154047f9461175f7807722bac3faf94c88f182b83a

130 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 and a machine learning classifier. The presence of PDF_FILTER_HEX with exploit indicators suggests the use of obfuscation techniques to hide malicious content. The embedded file further indicates a dropper or exploit delivery mechanism. The ML classifier's high confidence score supports the malicious nature of the document.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Exploit.Dropped-90 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-90
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0001.bin` `2a9ccd66ce539b1caf7dc82a05ee7071985097b6432f5274e281a9257ed869b3`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0x5A	1874 bytes

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