PDF malware analysis — malicious · ecea4a9a2a89947e

MALICIOUS

PDF

4.0 KB

MD5: 63e6d92aa3120aa6d4438da86f8e153e SHA-1: 07e18d08cf9d7fa0eb2bce0280f25c2fc8ab829f SHA-256: ecea4a9a2a89947e70b7820b2cfe07cd85ae9f7a95dcdfb11a8106b2b3058e1f

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 JavaScript stream exhibits obfuscation and uses eval() and String.fromCharCode(), suggesting it's designed to execute arbitrary code. The deobfuscated JavaScript artifact 'acroform_b64_00.js' is likely responsible for downloading and executing a second-stage payload. The presence of these indicators points to a malicious PDF designed for payload delivery.

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` `ab87a3b6d9862e01f156f34534f7b1b3eb9fbddfb6309c010156da03f67cbbd3`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6265 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` `642c5367a0492d416d918b7c7496f32fc7bc0a6fc6b5552ed80cdcb323f8d063`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3546 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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