PDF malware analysis — malicious · e9a333877d5e6fab

MALICIOUS

PDF

4.0 KB

MD5: 863704556eac6cd0891c667361fad689 SHA-1: 04a1871e9d8a0a718866c3f60d3ead7ccc216fda SHA-256: e9a333877d5e6fabfd747c1c7f861f5e877fc9f493c02fea33c69750d4583376

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, PDF_JS, and PDF_EVAL. The extracted JavaScript artifacts, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', show signs of obfuscation and contain eval() calls, suggesting they are designed to download and execute further malicious content. The presence of String.fromCharCode further supports the obfuscation technique used to hide the malicious script's true intent.

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` `ee89a2ec5677736e59017ffdb6344ac9d7b53e29c75ee6bdbe3ba77592b92bf8`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6357 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` `24d1683b3dddd3b3e88ec60f97b284973ece011df656f14f67912687bdd32160`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3614 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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