PDF malware analysis — malicious · 92e9dacce994ebd9

MALICIOUS

PDF

4.0 KB

MD5: 9ffb6d0650d6b9727124dfed9f4211fc SHA-1: febe4de507d9c51d6506af3f2b5ea42957f4cbd0 SHA-256: 92e9dacce994ebd99ce7dff32c170e912aba7e4e9f11f5de89b99a02032d79eb

66 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 firings, along with the 'Suspicious extracted artifact' heuristic, suggests that the JavaScript is obfuscated and likely performs malicious actions such as downloading and executing a second-stage payload. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are the primary indicators of this behavior.

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` `d01a7c2c858a69cead6a086ea08362dcd7cd5501ccf7aa6bbc0dde971848121f`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6289 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` `1534f16af78feef76134daf4847dda48727dc9e1eb98b52c7ab70c103d739b0d`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3562 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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