Nemucod PDF malware analysis — malicious · 28d0678673abc222

MALICIOUS

PDF

82.8 KB Authoring application: PyPDF2

MD5: e96f0e0b81d772cb01d38cbc046f089c SHA-1: 48532019afce9a9eb9b372edaa3791fd675847dd SHA-256: 28d0678673abc222175d68154c407d64c7a6b20f160eb14558d553c80f9b6a7d

228 Risk Score

Malware Insights

Nemucod · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged as malicious by ClamAV with the signature Txt.Downloader.Nemucod-6769573-0, indicating it is a Nemucod downloader. Heuristics indicate embedded JavaScript with eval() calls, suggesting obfuscated code execution. The extracted JavaScript artifacts, javascript_obj0036_000.js and javascript_obj0036_001.js, likely contain the logic for downloading and executing a secondary payload, a common characteristic of Nemucod.

Machine Learning

Nyx PDF Classifier malicious score 0.9936

Heuristics 6

ClamAV: Txt.Downloader.Nemucod-6769573-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Txt.Downloader.Nemucod-6769573-0
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
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0036_000.js` `9faa1a474b1b924d01fda7a7fcbedf9140c4bccba1693e2a17d977981bbeceb2`	pdf-javascript-stream	PDF /JS object 36 at offset 0x13DB	17433 bytes
Detection ClamAV: Txt.Downloader.Nemucod-6769573-0 Obfuscation or payload: likely Carved artifact contains 48 eval/decoder/string-building token(s). Carved artifact contains 2 long hex-escaped blob(s).
`javascript_obj0036_001.js` `42c3829f6187416f8cfef1bab13fca16e667b31b761502048f763a6139f9d54d`	pdf-javascript-stream	PDF /JS object 36 at offset 0x13DB	232 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).

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