PDF malware analysis — malicious · d83237a5196a6f98

MALICIOUS

PDF

144.8 KB

MD5: b89fa058250ab69b2d15dbcc4332d320 SHA-1: 5506c024feedd17a5e10f37c1b0144b5d3081413 SHA-256: d83237a5196a6f98f9c58868324ab13c19919e94f9ab9f83d1756d5c86622f58

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including a call to eval(), which is a strong indicator of malicious intent. The ML classifier also flagged this PDF with high confidence. The presence of a secondary embedded PDF further suggests a multi-stage attack. The primary function of the embedded JavaScript appears to be downloading and executing a second-stage payload, as indicated by the heuristic firings and the nature of the extracted artifacts.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Suspicious extracted artifact medium 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.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `8874d9a6d8a4a3965a3ee37841c7687f6f88476084b722ece396f1dbdd4d03f7`	pdf-javascript-stream	PDF /JS object 7 at offset 0x2B1	21623 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
`polyglot_child_pdf_off000235d1.pdf` `fa0bdf2079e8ba3d70a45964d46be897a3cb65564f4dac94a8e6328740267f8a`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x235D1	3414 bytes

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