PDF malware analysis — malicious · e338ae790cfa54b6

MALICIOUS

PDF

4.0 KB

MD5: ec07e64e2735fc22f19140fa82f39159 SHA-1: 8576d14c41f4f13a22f28ea7e04597090f28a7fe SHA-256: e338ae790cfa54b6e00fefa2430db8a76e5830eed547cd2430b28b3f07c278fd

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE rules, along with ML_NYX_PDF_MALICIOUS flagging it with high confidence, suggests the JavaScript is obfuscated and intended for malicious execution. The deobfuscated JavaScript file 'acroform_b64_00.js' was extracted, and while its exact function is not fully detailed, the heuristics point towards it downloading and executing a second-stage payload. The confidence is slightly reduced due to the lack of explicit URL or execution command IOCs within the provided evidence.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `1c626d1c98832366eefdb44992f2791c8cfdc03ca42772e56a80ca0bdc0a8829`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6357 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `e104d3768fab0482cd9eaa4716f8fa22d09c11879bd2b851c882c79e4f86a841`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3613 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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