PDF malware analysis — malicious · 3a327ff847399675

MALICIOUS

PDF

5.0 KB Created: 2011-04-05 23:46:28 Authoring application: sab

MD5: aa304c36f651a206e65babee23caa531 SHA-1: cae6bac7a480bd64923e1e02b8b1949d70996f50 SHA-256: 3a327ff847399675f98ef5d870e29ea886b0c95b7cc4a18658ae3073829e8bd5

70 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 JavaScript

The PDF file was flagged as malicious by an ML classifier with high confidence. Static analysis revealed an embedded JavaScript payload within a PDF stream, indicating an attempt to execute malicious code. The extracted JavaScript file, 'stream_001_off00000302.js', is the primary indicator of compromise. The XFA form and embedded file heuristics further support 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_off00000302.js` `78173968bc7c9f573f7bd55c15fc6e2d4af75c084576e1d6dc3c4f7e3963a06f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x302	54692 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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