PDF malware analysis — malicious · a8f84b8dcf3813bd

MALICIOUS

PDF

4.1 KB

MD5: 62be053ab4c28759e34e902462ed708c SHA-1: 3deb30f938588409c4c320cf66599adb2d363515 SHA-256: a8f84b8dcf3813bdbef28203d96590d49bd946bcdf0a8d95955f2dfd10db773d

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

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 file 'acroform_b64_00.js' was extracted. This script is likely responsible for downloading and executing a second-stage payload, a common technique for initial access. The confidence is moderate due to the obfuscated nature of the script, making precise determination of its actions difficult without further dynamic analysis.

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` `d4375bea50aefd02542ab85c3665743dc54eee2fe836aa1dd900284971c33f2c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6465 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` `b4944ffee6ac0f45fb5cbe01e84853af6fdb82bfbbfcf6c5b711a274945c6ca4`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3695 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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