PDF malware analysis — malicious · 4302bb78b20655a7

MALICIOUS

PDF

4.1 KB

MD5: b69dcdd08b543633c76e1a38ab6d9d53 SHA-1: 3799137a7beb1e9fcb3215b5e46e0827032bd5c7 SHA-256: 4302bb78b20655a77e1a723cc1f3885376e3c4944d09a7e14d81305818865393

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL and PDF_FROMCHARCODE firings suggest that the JavaScript is obfuscated and uses eval() and String.fromCharCode() to execute code. The deobfuscated JavaScript, acroform_b64_00.js, likely attempts to download and execute a second-stage payload. The presence of these obfuscation techniques and the execution of embedded scripts are common in malware delivery. The extracted filenames 'acroform_b64_00.js' and 'javascript_obj0013_001.js' are included as IOCs.

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` `e9c6b1d8085ae6af9ca996ad6738cf1ba8c961b9b97de14cca0cc97512a9c377`	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` `c6bc99e0d7238211dfb98a98eb734d9fcd7b0c6d1fbc9e8db8c8bbd2748b4767`	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 1 long base64-like blob(s).

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