PDF malware analysis — malicious · 7fdd20541c5fcf30

MALICIOUS

PDF

23.6 KB

MD5: 3418fef734a2d082b29d2cebe77e7d20 SHA-1: b0a5d553ea9350cca9b1477e9d8f2d370cc83d82 SHA-256: 7fdd20541c5fcf3014ad979f457e817c0a0dc8f7a46c1c50eb9b1becda1c41fc

120 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF sample contains embedded JavaScript, flagged by multiple heuristics as a potential exploit. The JavaScript, found in 'javascript_obj0099_000.js' and its deobfuscated version 'deobfuscated.js', is heavily obfuscated but the presence of 'String.fromCharCode' and the 'PDF_JS_EXPLOIT_CLUSTER' heuristic strongly suggest it's designed to exploit a vulnerability. The ML classifier also confirms a high likelihood of maliciousness. The primary function appears to be downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

Heuristics 7

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.
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)
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0099_000.js` `5bd689a45a157e0f6fa0286ce2333398a0e7eb12a0699a5b206215f0932f9387`	pdf-javascript-stream	PDF /JS object 99 at offset 0x548D	8621 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 9 long base64-like blob(s).
`deobfuscated.js` `8de765ee495e7cf11f1b7736e8e08ce9c7ff7ff058d372e8c31a5695306de48d`	deobfuscated-js	PDF JavaScript deobfuscation pass	39840 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 18 long base64-like blob(s).

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