PDF malware analysis — malicious · 1708b5ad99ce658b

MALICIOUS

PDF

141.4 KB Authoring application: PyPDF2

MD5: 6f8001fd966546a9df5d5e5a83b04714 SHA-1: 1ec4d6b782ee40e527b14d173a8ac15ccc222173 SHA-256: 1708b5ad99ce658b162a358feeab6bc8db26bbfa03387c05725bd24ccf2cca26

266 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript that utilizes eval() and obfuscated code, strongly indicating an exploit attempt. The presence of PDF_JS_EXPLOIT_CLUSTER and a ClamAV detection for 'Txt.Downloader.Nemucod-6769573-0' suggests the script is designed to download and execute a malicious second-stage payload. The document's structure as an image-only lure further supports a phishing or social engineering attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9858

Heuristics 8

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 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
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE

PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 141 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
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_obj0004_000.js` `b1a15dae7abb8932a65314d45480156570b8243e9dcdd83c69d0b55e26245585`	pdf-javascript-stream	PDF /JS object 4 at offset 0x1E2	17211 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_obj0004_001.js` `99805d3b927a342fc46bb63bdc6aa57a44aa3bf3d2d4521805b75b58591d5477`	pdf-javascript-stream	PDF /JS object 4 at offset 0x1E2	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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