Nemucod PDF malware analysis — malicious · 8ab04e4a004ac29a

MALICIOUS

PDF

126.1 KB Authoring application: PyPDF2

MD5: c4d2e8e6fdfc4656406c5a257289d741 SHA-1: 54e597eee985297187b8da338a4349e61fcc81b8 SHA-256: 8ab04e4a004ac29a4d81ecd8af3721929426f422f3f768e3a31986695482adea

226 Risk Score

Malware Insights

Nemucod · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV with the signature Txt.Downloader.Nemucod-6769573-0, indicating it is a Nemucod downloader. Heuristics confirm the presence of embedded JavaScript with eval() calls, suggesting code execution. The extracted JavaScript artifacts, though obfuscated, are consistent with the typical behavior of Nemucod, which is to download and execute additional malicious payloads. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9888

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_obj0054_000.js` `1fd2e692e922a540bffe9441b909eb465174c37a03c3b9087b268764442341df`	pdf-javascript-stream	PDF /JS object 54 at offset 0x4ABE	17479 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_obj0054_001.js` `911e35fb203654e4133e341ffbc256107d8a94a4fcb4612071d8e1c4ba3c5882`	pdf-javascript-stream	PDF /JS object 54 at offset 0x4ABE	737 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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