PDF malware analysis — malicious · cfa76a7d4f1e59e5

MALICIOUS

PDF

4.1 KB

MD5: 67eec4403cf3acc4e549dfbd6592f66b SHA-1: 66e0348d55f905a57b68d302dc6ef525df27dcdc SHA-256: cfa76a7d4f1e59e5500ee96e5940432dcc28c06fadb189a468c49bd4ab2ee824

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 presence of PDF_EVAL and PDF_FROMCHARCODE suggests the JavaScript is obfuscated and uses eval() to execute code. The deobfuscated JavaScript file 'acroform_b64_00.js' was extracted, along with another JS stream 'javascript_obj0013_001.js'. The obfuscated nature and use of eval() strongly suggest the script is designed to download and execute a secondary payload.

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` `ee8013d2ed38f5c18e929f193c9a82d0a4c4e846dda6d03c09cff1130d940889`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6365 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` `a51b6a637aaf3da7b2fe2f01b6f49262ae1afd6923f8460c7f37dda3bb33b1b4`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3621 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).

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