PDF malware analysis — malicious · dd2cb40060df369f

MALICIOUS

PDF

1.6 KB

MD5: ebc6bd08b7a798c2dcd5fbcdf09cf5f5 SHA-1: 4d492d339ba922b0fdd645665d176f7ce59af19d SHA-256: dd2cb40060df369f5cc8ba0fc7551cd33ad53132412d564809dd448d4c4dd673

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Script Execution T1566.002 Phishing: Spearphishing Attachment

The PDF contains obfuscated JavaScript, including an eval() call and String.fromCharCode, which is highly indicative of malicious intent. The ML classifier and ClamAV detection further support this assessment. The embedded JavaScript file, 'javascript_obj0009_000.js', is likely responsible for executing the malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9972

Heuristics 6

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` `0ae5455172e785f6d335cd3a6177ff9cc890b01239941de2e6a0495b04c294ee`	pdf-javascript-stream	PDF /JS object 9 at offset 0xDC	3909 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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