Txt.Malware.Nemucod-6769585-0 PDF malware analysis — malicious · 823b62c66f66ffa0

MALICIOUS

PDF

112.0 KB Authoring application: PyPDF2

MD5: 48f20b9e246e2fdd0511176a1eb88df8 SHA-1: 0b81941957af6bfb278969da4215e807eee868db SHA-256: 823b62c66f66ffa0963ce23115d3184a285a6aac9718b65f676385aa8d6b0a82

278 Risk Score

Malware Insights

Txt.Malware.Nemucod-6769585-0 · confidence 95%

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is flagged as a critical exploit cluster. The JavaScript is obfuscated and uses eval() calls, indicating it is designed to execute malicious code. ClamAV detection further confirms its malicious nature, identifying it as Txt.Malware.Nemucod-6769585-0. The embedded URI is benign, but the primary threat lies in the JavaScript execution.

Machine Learning

Nyx PDF Classifier malicious score 0.9930

Heuristics 9

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.
ClamAV: Txt.Malware.Nemucod-6769585-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Txt.Malware.Nemucod-6769585-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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.
External URI low PDF_URI

PDF contains an external URL action
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.copyright.gov/1201/comment-forms

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0010_000.js` `e1e40e4e278d3b635a48742b439a3b99ea3c014149dd579ca7243d709274ab99`	pdf-javascript-stream	PDF /JS object 10 at offset 0x3C0	66312 bytes
Detection ClamAV: Txt.Malware.Nemucod-6769585-0 Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0010_001.js` `38062ac3f33aa9d600cefe6a583a1ab1d6326b5058fce3e38cdfd004c0eb0e03`	pdf-javascript-stream	PDF /JS object 10 at offset 0x3C0	62071 bytes
`font_00_cff_off000185f1.bin` `897153ac90adb815c5c10c332e07de1a187130c97ec80c646ebf4962b5865742`	pdf-font-stream	PDF embedded font (cff) at offset 0x185F1	310 bytes

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