PDF malware analysis — malicious · d21d4f76045e260d

MALICIOUS

PDF

5.2 KB Authoring application: saerb

MD5: 06a09a9a5e83763fb717e844958b440f SHA-1: 7af0451785928bda4595362729b08f28d8b2e130 SHA-256: d21d4f76045e260d7efd1fc6608d9241202d7c6a7117c35323933fabf8fc88c4

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, indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic. The extracted JavaScript file, 'stream_001_off000002e9.js', is likely responsible for executing the malicious actions. The document body is unreadable, providing no further context on the lure.

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_off000002e9.js` `9860b8cb45f04c9cf0065127418b7bed7951c38e6211fce1f8bb4dd5ba1b2505`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2E9	63982 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s).

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