PDF malware analysis — malicious · 238f0360773f2cc1

MALICIOUS

PDF

5.3 KB Authoring application: stb

MD5: be55831246e78060fab3fed50bfe3a2c SHA-1: 465a60d04434b8ef9725de947ff52ac4e7d026a4 SHA-256: 238f0360773f2cc18f2690c13476463183288ff8dd94c7f25fdfc8feaaa4bfd2

70 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF was flagged as malicious by an ML classifier with high confidence. Heuristics indicate the presence of an embedded script payload, specifically a JavaScript file named 'stream_001_off000002e7.js'. This embedded script is the primary indicator of malicious intent, likely serving to download and execute a second-stage payload. The PDF structure also shows signs of XFA forms and embedded files, which are sometimes used in exploit delivery.

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` `e8069324a19b42e06391818f48586276377c8df0818ef0cfdc7d256e33aa4458`	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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