PDF malware analysis — malicious · 45d0c335e37ca692

MALICIOUS

PDF

4.8 KB Authoring application: zsrb

MD5: b600f9f6b06792c4c5205ff990daa070 SHA-1: a895e4e3cadf6ab12c7d75715429b158c40caf4d SHA-256: 45d0c335e37ca692a29cf842f2cb6b4a0373310023b83ea7823c8e7018e36edd

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, named 'stream_001_off000002b4.js', is the primary indicator of malicious activity, likely serving as a downloader for further stages of an attack. The document body content is unreadable, providing no further context.

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` `703c80049af61a9084f25e2cc81406df05158529dbabe68609d0e0c4cb86b85a`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2B4	42656 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).

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