PDF malware analysis — malicious · 41daf8bce85dd5f1

MALICIOUS

PDF

5.1 KB Authoring application: sarb

MD5: 058d931b05fd1d4a5413b4fe79808806 SHA-1: b164cfeb4ce46f3b08cf10478436f80ab6afa5a3 SHA-256: 41daf8bce85dd5f16954efd71a6fad6a5382a15411975781592e4cd3217ef258

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. Static analysis identified an embedded JavaScript file within a PDF stream, indicating a potential delivery mechanism for further malicious activity. The presence of XFA forms and embedded files further supports the malicious nature of the document. The embedded JavaScript is the primary indicator of malicious intent, likely serving as a downloader or exploit loader.

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_off000002e4.js` `10de1116fc53dfe80a22d4c6b0d9a8daf6df99406321b4babd010982dde52c79`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2E4	62552 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s).

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