PDF malware analysis — malicious · bf3d9b25ac30cb7d

MALICIOUS

PDF

4.1 KB

MD5: c03d04ff9b3add8b60bd0164a8622a39 SHA-1: 6d060b04b8daeff69dcfa01a034db7129cae0be1 SHA-256: bf3d9b25ac30cb7dfac131eb0429b8cbc9b590751de726bac5afa29c0db8d5be

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF file contains embedded JavaScript, which is heavily obfuscated and uses eval() and String.fromCharCode. This script is designed to download and execute a second-stage payload. The presence of multiple JavaScript streams and obfuscation techniques suggests a downloader or droppper functionality. The specific family is not identifiable from the available 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` `3d3149b9495e36422356d11c6a818f79238d92d5a602bf184c4f3e55ba1eeea2`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6517 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` `fe26921598d2876021262a5eba9d6a6effd7820748db877f254e1e6fea59efd3`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3734 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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