PDF malware analysis — malicious · 479d31a1dfa7ceba

MALICIOUS

PDF

5.1 KB

MD5: d5bedbd99f260b8e8230ae318c6af2b5 SHA-1: 9474b304fc95d1b2c28ee44efd6320a9005c2121 SHA-256: 479d31a1dfa7ceba7dc2c5d28df31841feb05abe80c0ceb93952624337065972

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL and PDF_FROMCHARCODE firings suggest that the JavaScript is obfuscated and uses eval() and String.fromCharCode() to construct and execute malicious code. The extracted artifact 'javascript_obj7693_000.js' is likely the source of this obfuscated JavaScript. The primary intent appears to be downloading and executing a second-stage payload, though the specific URL or execution method is not directly visible in the provided evidence. The lack of a readable document body means the specific lure cannot be determined, but the technical indicators point to a downloader.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj7693_000.js` `e4279deca1009228ea54a33f353392e63bf9d96549dd0e9b295bfd688f950d58`	pdf-javascript-stream	PDF /JS object 7693 at offset 0x136	8397 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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