PDF malware analysis — malicious · 406b1b16cd856746

MALICIOUS

PDF

4.0 KB

MD5: ab6c854682167d90f188fee02ee178e3 SHA-1: 23cfac624f3407f9a85925c5ed3799d66845e3e3 SHA-256: 406b1b16cd856746c4e6139be9a2962a6131c21543ad25a980fb1e67eb1b5609

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream includes an eval() call and uses String.fromCharCode, suggesting obfuscation. The deobfuscated JavaScript (acroform_b64_00.js) likely contains code to download and execute a secondary payload. The presence of these obfuscated scripts and the PDF wrapper strongly suggests a malicious intent to deliver further malware.

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` `1dc48d0f16e0336019cdee6e39a95f8bf553f132af60f08fc5fa9354792c982e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6381 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` `114d392acca0fc3ec7803381e4aec95cdfe33a51bcee91d80b8168b0240f638c`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3632 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).

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