PDF malware analysis — malicious · bc132de570e571cc

MALICIOUS

PDF

21.0 KB

MD5: c40e81e5e8bb7d4cb775dafb631ba8e8 SHA-1: 97b883d7c22cecb20d1a4c9b1ea5df23cc51d0e4 SHA-256: bc132de570e571ccafc957dc382b5ce40e5825573ad20487b6d4f0061f2f5dba

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The script utilizes eval() and unescape() functions, along with String.fromCharCode, suggesting obfuscation to hide its true functionality. The primary intent appears to be downloading and executing a second-stage payload, as evidenced by the obfuscated JavaScript stream. The extracted file 'javascript_obj0007_000.js' is a key indicator.

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `9864171cc4152f5d3e5671809dd40cebe1cf9319d0b8bfb0abd003cff50482db`	pdf-javascript-stream	PDF /JS object 7 at offset 0x2979	332 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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