PDF malware analysis — malicious · 3e0effa9aa9ec569

MALICIOUS

PDF

107.2 KB Authoring application: PyPDF2

MD5: b9b42770e44e04e1c6f950918d2c2292 SHA-1: e50fcfc514a6137856bf95557a2619462926a3cb SHA-256: 3e0effa9aa9ec5690b72b9cffab3da839ba399ef10fe4fb88a8b77387d76b453

256 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by multiple heuristics, including critical ClamAV detections for Js.Downloader.Generic-6291049-0. Embedded JavaScript streams and eval() calls indicate the presence of obfuscated code. The ML classifier output of 0.991075 further supports its malicious nature. The primary function appears to be downloading and executing a second-stage payload, as suggested by the 'Js.Downloader' classification.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

Heuristics 8

ClamAV: Js.Downloader.Generic-6291049-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Js.Downloader.Generic-6291049-0
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
Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0015_000.js` `36e98659b91f62778efb3ee6109e047190204cdd0f63f2a5adbd1ec29e5c8792`	pdf-javascript-stream	PDF /JS object 15 at offset 0xFB0	1290 bytes
Detection ClamAV: Js.Downloader.Generic-6291049-0 Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`embedded_pdf_script_00001016.bin` `0b6b2d59f4391cb595234cbd5c0d227e935274c74da8fea2d0be6b875ed8d4f6`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x1016	109741 bytes
Detection ClamAV: Js.Downloader.Generic-6291049-0 Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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