PDF malware analysis — malicious · 7084828423913448

MALICIOUS

PDF

52.6 KB Authoring application: PyPDF2

MD5: 3093182d08fadd66bfc4ecc9f31f0190 SHA-1: 316c106c09f0435076b6bac5edc90ef6acfca537 SHA-256: 708482842391344850013f94cdf2248c78df78c39f4e11009ded854b19c829e6

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript that is heavily obfuscated and utilizes eval() calls, indicating malicious intent. The ML classifier and PDF exploit cluster heuristics strongly suggest this is a malicious PDF. The script's primary function appears to be the execution of further malicious code, likely downloaded from a remote source, though the specific URL is not directly present in the extracted script.

Machine Learning

Nyx PDF Classifier malicious score 0.9923

Heuristics 6

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
eval() call high PDF_EVAL

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

PDF has 2 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `3b5a2aa41c5c710c8d14e1ce859cd60310fc9df64648a0c1b5d1d596dc95007b`	pdf-javascript-stream	PDF /JS object 4 at offset 0x3D4	7231 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 3 eval/decoder/string-building token(s).

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