PDF malware analysis — malicious · 9f9894b7be442641

MALICIOUS

PDF

177.8 KB

MD5: a02581bfe4aacb2e7000c49fc6070386 SHA-1: 56566f8e4b67686933e15ca08a9b571f6be43059 SHA-256: 9f9894b7be4426412a5edfcfef2661eccc42fa33c199bd6ce4e97145ab7c6437

76 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Phishing: Spearphishing Attachment

The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream is obfuscated and uses String.fromCharCode, indicating an attempt to hide malicious code. The primary function of the embedded script is likely to download and execute a second-stage payload, as suggested by the heuristic firings related to JavaScript actions and streams within the PDF.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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
`javascript_obj0008_000.js` `69bb831d0894b508744be0608e3b37278090c98a4316c8efdb057cb0fe98c717`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	60421 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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