PDF malware analysis — malicious · 3b71e2e9fa992287

MALICIOUS

PDF

4.0 KB

MD5: 8f871897625638fcfdd27c078f92ab98 SHA-1: 8c20e96ad4b83e6ea184ef587da145bdfc88d382 SHA-256: 3b71e2e9fa992287f260cbb40d0387059bf5d5e070cabe214b6ec9eacbbd179c

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The `eval()` call and `String.fromCharCode` usage within the JavaScript streams suggest obfuscation and dynamic code execution. The extracted JavaScript artifacts, particularly `acroform_b64_00.js`, are likely responsible for downloading and executing a secondary payload, which is a common technique for initial access and further system compromise. No specific family could be identified due to the generic nature of the obfuscation and lack of network indicators.

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` `5e605cb70e2649045a093e5b87745a32bf4b2db1ea0c85e76a7a30242939f50f`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6329 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` `cae4377434c25a874c317a8f3023cc820397bd2ebf3817f24fa811c237974601`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3592 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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