PDF malware analysis — malicious · cd4b9ca8533dd1ca

MALICIOUS

PDF

4.0 KB

MD5: c163f177c7806e4ad5ee4f50f06f4ad9 SHA-1: 2eba9a7603285d3f54e8f89bf2b0ff88fda3c8da SHA-256: cd4b9ca8533dd1ca28e18f6a4cafa6718d5e0bc2fe5fc1e2074e44e899b58442

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Script Execution T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of obfuscated JavaScript streams and suspicious extracted artifacts like 'acroform_b64_00.js' and 'javascript_obj0013_001.js' suggests the script is designed to execute malicious code. The eval() call and String.fromCharCode usage are common techniques for deobfuscating and executing payloads. The likely intent is to download and execute 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` `18f0532e417673779e337c6285b376dbe74583d43097c6f098a688ba5fbbc148`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6321 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` `8650753e018795daba8ee94bd39aca833005969d3a066150df9e8f10ce00312c`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3587 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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