PDF malware analysis — malicious · 20c497fb3f2a02b8

MALICIOUS

PDF

180.8 KB

MD5: 3d5b490cd0632b234ed9027608d268ee SHA-1: 2b8461231e715f484df6ace17c3e6136b42fb4e7 SHA-256: 20c497fb3f2a02b8d2198fdabf5db9c7da0ce105cc6a30b47abe3d0baf616e88

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript streams, with critical heuristics indicating the use of eval() and unescape() for obfuscation. A secondary embedded PDF was also found with similar suspicious findings. The presence of these elements strongly suggests the PDF is designed to execute arbitrary code, likely to download and run a second-stage payload. The specific JavaScript and embedded PDF artifacts are flagged as IOCs.

Heuristics 7

Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
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)
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.
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0052_000.js` `45fea71ee6347153ec3719ebc3910509cd6fa568f263c29e7474c694308f5c7d`	pdf-javascript-stream	PDF /JS object 52 at offset 0x3F4E	301 bytes
`javascript_obj0059_001.js` `480b0613f4e3c93c5538766bc6ad095eead1a5b8229e2dff8b199fe31ca49d57`	pdf-javascript-stream	PDF /JS object 59 at offset 0x6483	2611 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
`stream_005_off00000b74.bin` `e4217c167299ac63f64b8b7e903cc0196f0828693d273431b8b793a12ed0fed3`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xB74	1000 bytes
`objstm_0053_00.bin` `f9797d0fa28384c30d8bf1da89163104ce539753e417fa1f9c5fd135d1eceb39`	pdf-objstm-decoded	PDF /ObjStm 53 0 obj (inflated)	50 bytes
`polyglot_child_pdf_off00026781.pdf` `37d933ad18da515523d7d58fee6a79df36ff774c79d98e945313faee99b66a29`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x26781	27574 bytes

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