PDF malware analysis — malicious · 4db0fba6421742e9

MALICIOUS

PDF

5.3 KB Authoring application: stb

MD5: 04c033986d465ed73f6afcd3e09be0a7 SHA-1: ea3f3efed5738d2b85079a443f7a7d4c38bbbb41 SHA-256: 4db0fba6421742e96712a69b63ecd8a3dc61094f3c9e09a6c8fefa974a946783

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 file, indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic. This embedded script is likely responsible for delivering the malicious payload. The 'ML_NYX_PDF_MALICIOUS' heuristic further supports the malicious nature of the document.

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_off000002e7.js` `3ced3dde87000274797b4edf68c43abe2cf8cf2a5269404e1a08abfdda23e93f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2E7	73945 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 long base64-like blob(s).

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