PDF malware analysis — malicious · 84e07ccb2249a6f7

MALICIOUS

PDF

5.86 MB Authoring application: substr

MD5: fb99085d8ed7464e7a6253f4ca3a960a SHA-1: 439f4ddaa72106049ebbf5cd9a58b9a0e9625fb4 SHA-256: 84e07ccb2249a6f7e21689cdfdbc518b3250e2d92819506d8c7f2cbb2e9c21b9

80 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file exhibits multiple heuristic firings related to embedded JavaScript and suspicious static findings within an embedded secondary PDF. The presence of JavaScript actions and embedded JS streams strongly suggests an attempt to execute malicious code. While no specific URLs or scripts were directly readable, the overall structure indicates a downloader or exploit delivery mechanism.

Machine Learning

Nyx PDF Classifier clean score 0.0157

Heuristics 6

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.
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.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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/pdf/1.3/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 15

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `19d105ce645920f83174c87e1c3f529f4f5b97cb89ae18049b811e1804605b06`	pdf-javascript-stream	PDF /JS object 1 at offset 0x3D2CC	489 bytes
`stream_011_off0000d5da.bin` `4953ce955d2ee88454f031cbaf183613f0c08bb02217da919121249b3c8ba3d5`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xD5DA	87216 bytes
`stream_012_off00018a45.bin` `c259cd8843785784a9c8c9396881ab6921d228cb5ee7c633ccf3f26e66337773`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x18A45	86596 bytes
`stream_022_off000605d7.bin` `b85f5e73461e5e1af229ac957ed71f61201a0b5a277dea3c354ace88eec1b0e6`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x605D7	26204 bytes
`stream_050_off000efe03.bin` `3e62a4e7ba9c65e4eb20e694d4f1373782baed9738e7a11e68b3bf34c00158d4`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xEFE03	188106 bytes
`stream_051_off000fab32.bin` `050fea696be88d2ecfac9982d9ee7b13f0317b2fc46d2a88b8b6b0a81a9c5757`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xFAB32	181686 bytes
`stream_088_off0019a24c.bin` `c24fc71523a4c386b5296eb738de580a7a071becd3671ad55774653ec945923b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x19A24C	717410 bytes
`stream_098_off00217138.bin` `afdeeb3bc942fafb314a4597f70cfa968c28c403b177e1ef0bc8251487700d06`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x217138	717410 bytes
`stream_100_off0023f763.bin` `344a52ca3c3d94db69820d1fe6fca7be8615fc4bfc98286f7f9626f1bc729e60`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x23F763	717410 bytes
`icc_00_off000056ef.icc` `2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e`	pdf-icc-profile	PDF ICC profile at offset 0x56EF	3144 bytes
`font_02_sfnt_off00024041.bin` `1244cd04269ccf37b81a170b81d5d783eb3aa1a8954d869ca047c3a7a3197549`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x24041	77248 bytes
`font_03_sfnt_off0002e068.bin` `5d35a50bf545034b2fbe001e72dc3cffcc7f3b4d82e685906a64e53c49500b80`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2E068	60280 bytes
`font_04_sfnt_off0007dd16.bin` `b58c33098c25cfa616608de1d68e4c666e1d0a001e6aa4bb2862a047d059df83`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7DD16	17543 bytes
`font_05_cff_off000b9f5c.bin` `8e982609fb7f7dd147e0b2f7fdc1277574016fb2da027f754409e1ed8b003265`	pdf-font-stream	PDF embedded font (cff) at offset 0xB9F5C	4471 bytes
`polyglot_child_pdf_off00034e2a.pdf` `d7b0737efebe5209609e4b166bf570917201cde53ca5fae560e8e6a974fef845`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x34E2A	5927382 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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