PDF malware analysis — malicious · 3edb6130a07412e7

MALICIOUS

PDF

4.0 KB

MD5: 3782b830acd58f6a71dae4387d8daf3c SHA-1: f3971206b9da3ee6a203df26526328b5d684a98d SHA-256: 3edb6130a07412e7858a69cd091549c8b95a6167efa00ad71c43fa2c634007db

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 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 extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are suspicious artifacts. The primary function of the obfuscated JavaScript appears to be downloading and executing a second-stage payload, which is a common technique for malware delivery.

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` `7ba17322c55972bd51328310a78ab63842bcf54973ed5d8e594d1ff1a7a313b3`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6285 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` `9258ddef110d06a36630bc8c20eaa0461775a1309d20d3d941e2529e4d0c0d53`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3559 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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