PDF malware analysis — malicious · a4ed28dc21043440

MALICIOUS

PDF

4.0 KB

MD5: a10e755ed4596c80d38934240ce50745 SHA-1: 706749d5d599dcdf24a01d9bd71401fe4e089f64 SHA-256: a4ed28dc21043440b5a1ed26395399dd8231eca1f7baa9fe2dc0b87d91ea15fc

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream exhibits obfuscation, including the use of eval() and String.fromCharCode(), as flagged by PDF_EVAL and PDF_FROMCHARCODE. The deobfuscated JavaScript file, 'acroform_b64_00.js', suggests the script's purpose is to download and execute a secondary payload. The presence of obfuscated JavaScript and the execution of eval() strongly suggest a malicious intent to compromise the user's system.

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` `690e9efe645e289a1d20c3f80bddb105dae0b28e6e85fbe15ee93e3b07c2decb`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6269 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` `feea4ae79d1861b677ba2b50164b5a3d8f64f59ff229aeb20578691f61d7bf4f`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3548 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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