PDF / .MAL malware analysis — malicious · 8c91c4fd81a86e2a

MALICIOUS

PDF / .MAL

155.3 KB

MD5: ace05d8a808e4ee3427a3131770de0d7 SHA-1: 506bf54b5ec151b7d4f662fea67819abebc7c36b SHA-256: 8c91c4fd81a86e2a759684e8eb676733ff520dd958246c0afd6fae2795235f5e

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript streams that utilize eval() and unescape() functions, indicating an attempt to obfuscate and execute malicious code. A secondary embedded PDF was also detected with similar suspicious findings. The primary function of the script appears to be the execution of arbitrary code, likely to download and run a second-stage payload. The presence of multiple PDF-specific heuristics, including JavaScript actions and eval calls, strongly suggests malicious intent.

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` `28d6113dc29ef94de179a1345b6983a9d947da00c945e958d0554de4748a5164`	pdf-javascript-stream	PDF /JS object 59 at offset 0x6483	2612 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_off000201ac.pdf` `fb2b52d852722f9b426665a5f60047fc463cd643a8f13b317d15efab7307f861`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x201AC	27574 bytes

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