PDF malware analysis — malicious · f59e7d1415d58966

MALICIOUS

PDF

12.0 KB

MD5: d4d80270831b26d37c66af0b10f7310e SHA-1: c63b75488a0461da758b29390522cf5a56a6fe8a SHA-256: f59e7d1415d58966b4e0ed90eb3040a7c33acccc12b8fd3d925a639907db1290

128 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF exhibits multiple indicators of maliciousness, including the use of ASCIIHexDecode filters with exploit indicators and a high ML classifier score. ClamAV detection as 'Pdf.Exploit.Dropped-90' further confirms its malicious nature. The embedded file suggests it's a dropper for further malicious content.

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` `22637658796457522823ad882288382921cda257e1323e2eb2a8319618de8ae3`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0x5A	1874 bytes

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