PDF malware analysis — malicious · 8a6291bbb907a466

MALICIOUS

PDF

4.0 KB

MD5: cd387b1ded7ac41666ea2e3da293c876 SHA-1: 6f3600df6166ecdd2e448b0f4534d02ea9028a27 SHA-256: 8a6291bbb907a466f67a07c6e2d562c0a01aefaae9a1cda16fa66ee96ae32691

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 utilizes eval() and String.fromCharCode, suggesting obfuscation and dynamic code execution. The deobfuscated JavaScript file, acroform_b64_00.js, likely contains logic to download and execute a secondary payload. The presence of these elements strongly suggests a malicious intent, likely for delivering further malware. The specific family is not identifiable from the provided evidence.

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` `a606d168d3205d8cbfa1a4ea5e2f5a4826e7a871aa5ee8a9373365d8a0084295`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6353 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` `45ab6a63a201586bc7156369594a41b8f191f13483052207004eb0bc8874c971`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3610 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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