PDF malware analysis — malicious · 89f710bd39dafa9c

MALICIOUS

PDF

4.1 KB

MD5: 677f8b82e616637a0283b5d1583f38d6 SHA-1: 966c88b9ebbeea3718c856cc9a1cbb0440c71f38 SHA-256: 89f710bd39dafa9ca41952a547672f8e4e6e6f0182f15f076694544840c76e98

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 exhibits obfuscation and uses eval() and String.fromCharCode(), suggesting it's designed to hide malicious code. The heuristic 'EXTRACTED_FILE_STATIC_TRIAGE' flags a long encoded blob and script obfuscation, further supporting this. The primary function of the obfuscated JavaScript is likely to download and execute a second-stage payload, although the exact mechanism cannot be determined without deobfuscation. The extracted artifact names '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` `e94757a1696236765ad02eb4cc35dc29b32c2d7be4ab8c73946c117f5461c8d8`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6449 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` `fd19dee131dcdcdb6c032363e20ec345ef9bd14a8a9fe2c89cbe42cba018a545`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3682 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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