PDF malware analysis — malicious · 9fe072a603fbfcf8

MALICIOUS

PDF

4.0 KB

MD5: d5262b6c185d29b5b25c3c2cef74530f SHA-1: c70df71a6fa234e2a25e958735ff2869b82f5a3f SHA-256: 9fe072a603fbfcf862e872ce4c9abdfa390d44088255d7e83471f207e428db52

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream exhibits obfuscation and uses eval() and String.fromCharCode(), suggesting it is designed to execute arbitrary code. The deobfuscated JavaScript file 'acroform_b64_00.js' was extracted, along with another JavaScript file 'javascript_obj0013_001.js'. The primary function of the script appears to be downloading and executing a second-stage payload, though the exact nature of the payload is not discernible 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` `4e4fd1e2687ad598e515160293612794e16299f32b1fc2986af0d8ae253e968a`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6301 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` `ecd7326e5c06377519ec58790159ed4b8e0eaafa9be1995ba104416e4aa8a7e7`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3572 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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