PDF malware analysis — malicious · 376cbcc5b6564fe5

MALICIOUS

PDF

4.0 KB

MD5: 8b8e6f39a6d1c494268c2cb6ea507b78 SHA-1: 397c74ce4a076aadc60f94a6b5f66d9a71fc341d SHA-256: 376cbcc5b6564fe5b6e3f2a1fd1d7a8c501aa1ce63c41b9dad09e01a82205c33

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Scripting: JavaScript T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The 'acroform_b64_00.js' and 'javascript_obj0013_001.js' artifacts suggest the presence of obfuscated JavaScript. The PDF_EVAL and PDF_FROMCHARCODE firings further confirm that the embedded JavaScript is likely being used to execute arbitrary code, potentially downloading and executing a second-stage payload. The lack of specific IOCs like URLs or network indicators limits the confidence in a more precise family attribution.

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` `7f1308c3d402af4e22d9ae06567a53158d0c03d347155f5bb23bf9e4916e6b95`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6377 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` `6933b8c7d1061a4fbb46d57f983557c6f9c611a2ea3283311c9786cd71344eb1`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3629 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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