PDF malware analysis — malicious · c4fcbcd192c24e09

MALICIOUS

PDF

173.3 KB Authoring application: PyPDF2

MD5: 21f814845b5634d069274ff84a37da50 SHA-1: 3cc064ddde0e7c93b64b8eef0b972ec9d745a059 SHA-256: c4fcbcd192c24e09a05c318b9ad046b577a60d0766071f2c23eba4ebbc0af953

92 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an eval() call within the JavaScript (PDF_EVAL) suggests code execution. The ML classifier strongly flags this PDF as malicious. While the document body is unreadable, the heuristics and the ML score point to a malicious PDF designed to execute embedded scripts. The primary script, javascript_obj0004_000.js, is large and likely contains obfuscated code intended to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `a897972482acdf737a9c7fd56ef221c33558dd82b79567676819a24ae62d43fd`	pdf-javascript-stream	PDF /JS object 4 at offset 0x134	134216 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0004_001.js` `9e3832edaec0a96d8c7bfbd5eb3edb94542a4e97367caf19eb84bccf4087edae`	pdf-javascript-stream	PDF /JS object 4 at offset 0x134	44 bytes

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