PDF malware analysis — malicious · c16a02fbb64cb5d8

MALICIOUS

PDF

4.1 KB

MD5: bb787c431bddc7aad26a9a3514ad6600 SHA-1: c65c2c3e3881ad516ca4e76032bfe1a8f111377d SHA-256: c16a02fbb64cb5d82ea760a8fb6642bd1b040be91333b0dcc416517132db43bb

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript streams, with one stream exhibiting `eval()` and `String.fromCharCode()` calls, indicating obfuscation. The presence of these obfuscated JavaScript artifacts suggests the document's primary purpose is to execute malicious code. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are likely responsible for this execution, potentially downloading and running a second-stage payload.

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` `f75aff6d4b004b46e30fdbbe67c9d7010c447e5ce1afd92322270ca4db50c0b3`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6417 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` `8d67f09afc40f01b99301129bf1fa24c74d74ad6d6457c03fa9027076090546b`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3658 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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