PDF malware analysis — malicious · a83c39fad6be1e9b

MALICIOUS

PDF

4.0 KB

MD5: 14a3d6a63e60f5b097a69d58bc7c1db5 SHA-1: 6b2dafd696b50d9accd1d02a539d1583d1704eef SHA-256: a83c39fad6be1e9bee1d3f9ba58b9d13445c4e13ade5dc55bb22a210d9b1cacb

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF document contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a PDF_EVAL heuristic firing suggests that the JavaScript is being used to execute arbitrary code, likely to download and run a second-stage payload. The deobfuscated JavaScript file 'acroform_b64_00.js' and the original embedded file 'javascript_obj0013_001.js' are the primary artifacts. The confidence is moderate due to the lack of specific URLs or network indicators in 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` `61dd72dfda7685e118a444c9bb0dc6967af95e43ba87282ae098f0bb3e81c818`	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` `689ece6c132b0d1a2a9a49b504b48d1c6594d497ff7db4080d3fb8413692a5a1`	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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