PDF malware analysis — malicious · 502ae1c3cc5f9fc2

MALICIOUS

PDF

22.9 KB

MD5: c78f6957cbd72f43ded33579a1d9cf8e SHA-1: f788e80d5f36ed67e86c1d6b8097df2587b4c357 SHA-256: 502ae1c3cc5f9fc2efad2502931396974aec5b5a1fafbfebbfffabadffc12cfd

134 Risk Score

Malware Insights

MITRE ATT&CK

T1027 Obfuscated Files or Information T1566.001 Phishing: Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The PDF file contains embedded JavaScript, which is heavily obfuscated using eval() and unescape() calls. This obfuscated script is likely designed to download and execute a secondary payload. The presence of JavaScript actions and streams, along with specific decoding filters like ASCIIHexDecode and ASCII85Decode, strongly suggests a malicious intent to exploit vulnerabilities or deliver malware. The extracted artifact 'javascript_obj3332_000.js' is also noted as suspicious.

Heuristics 8

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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)
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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_obj3332_000.js` `83945e09d8deb6e8659dc92dd40c8e708845c1a8d9e0fc3217679ee78200648a`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x595F	253 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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