PDF malware analysis — malicious · 7e757342fce0e818

MALICIOUS

PDF

1.6 KB

MD5: edb666b4e3dbd98f3a1a4b54f9917a17 SHA-1: ac40e0a6cb8eff6f9c91a6f4c73926b7af4fe8c0 SHA-256: 7e757342fce0e8180869696af1256ee50d5fed59c26beed1fee90309f580f61b

276 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1059 Command and Scripting Interpreter T1204.002 Malicious File

This PDF file contains obfuscated JavaScript, indicated by heuristics like 'PDF_OBFUSCATED_NAME_OBJECT' and 'PDF_EVAL'. The JavaScript uses 'eval()' and 'String.fromCharCode' to decode and execute its payload. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the 'PDF_JS_EXPLOIT_CLUSTER' finding. The ML classifier and ClamAV also flagged this file as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9969

Heuristics 8

Hex-obfuscated scripting name object critical PDF_OBFUSCATED_NAME_OBJECT

A PDF name object that drives script execution (/JavaScript or /JS) is written with #XX hex escapes to hide it from string-based scanners — e.g. /J#61v#61S#63r#69p#74 decoding to /JavaScript. Legitimate PDF producers always write these names literally; hex-encoding an executable name is a deliberate evasion used by exploit-kit and dropper PDFs.
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: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `b4088b0208d26355b39770e2b129d61765c69bbfe691c9da814dde0ad0718fdb`	pdf-javascript-stream	PDF /JS object 9 at offset 0xDC	3765 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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