PDF malware analysis — malicious · 440ae9bee98688c4

MALICIOUS

PDF

4.0 KB

MD5: 6f3ca504f3ba2eed06a12f8f70cd131e SHA-1: c20a49ebb464c4cebe33d238d813a4bd99dc99e0 SHA-256: 440ae9bee98688c4e4adf35d6ab9793c0cf9005cc65cd79fe3258b65129c04c9

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript streams, particularly 'acroform_b64_00.js', appear to be obfuscated and utilize eval() and String.fromCharCode(), suggesting an attempt to hide malicious functionality. The primary purpose seems to be the execution of this script, which likely downloads and executes a second-stage payload. Due to the obfuscation, the exact nature of the payload and its destination could not be fully determined.

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` `15698b0bcbaad2d57f842200f6a09532c78656a7b7ed6d7cf4369fc15e946371`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6369 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` `96897f486e5e88c2370da543736ce5c2437df4cc2cfc6b1e4333c994aa2efc14`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3624 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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