PDF malware analysis — malicious · 9a926c8bcb4b0931

MALICIOUS

PDF

4.8 KB Authoring application: zsrb

MD5: bf1d38dfd2195fe6ad87fad2d83d9c0f SHA-1: 52846a99c7da3989cbad04118393ec5f8e364ec3 SHA-256: 9a926c8bcb4b0931a1e398ab8ee1ef3cbcf545f0da88dcaf7e9b0f0af771b308

70 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged as malicious by an ML classifier with high confidence. It contains an embedded JavaScript payload within a PDF stream. This script is likely responsible for downloading and executing a second-stage payload, contributing to the overall malicious nature of the document. The presence of an embedded file and XFA form are also noted.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
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: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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_off000002b4.js` `be8a8692f679922a67a8a7510c7b58bb62742a18a9a53329992b648ebb89de49`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2B4	42546 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).

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