PDF malware analysis — malicious · c6726074f9decc9f

MALICIOUS

PDF

336.7 KB

MD5: e46bef7a5f9fb53bde5a5548f7265b19 SHA-1: 07a1ba1201541be33fa7bfef9e7f1cd3ba2838ec SHA-256: c6726074f9decc9fcd2a5b3dbe8767eb6143b8fda9a4ef881bbccf49b25db019

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains multiple embedded JavaScript streams, with high-confidence heuristics indicating the use of eval() and unescape() for obfuscation. This strongly suggests the script is designed to decode and execute malicious code. The presence of PDF_JAVASCRIPT and PDF_JS firings further supports this, pointing to a common PDF-based malware delivery technique. No specific IOCs like URLs or hashes were extracted, limiting the ability to identify the exact payload or family.

Machine Learning

Nyx PDF Classifier clean score 0.2457

Heuristics 7

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. (matched inside decoded stream)
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)
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://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 13

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_024_off000070d8.js` `0b1b1ccc66720369cfc1c63b2731d18a59fadcfae568b3b37a5bbb8ce4821cfd`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x70D8	3551 bytes
`stream_025_off0000764f.js` `92c7113721eda308ba793cbd194c0e585679c0ef14eaeeca6ba058b7831997aa`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x764F	41573 bytes
`stream_026_off0000927d.js` `f14def7c3a459fb4591cbe065d41d053c702364ed3b1ea5c7026641b1288e0d8`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x927D	22447 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 13 eval/decoder/string-building token(s).
`stream_027_off0000a4f6.js` `78e513d41bf2a661c7f60584b6d8c8887a33660b20594273baa225fb5ff396fb`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xA4F6	25462 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 38 eval/decoder/string-building token(s).
`stream_028_off0000bd4c.js` `752d2567001891def67f53ca21d10724ba8bcb02d888cbb5b1c4daf4defcac7a`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xBD4C	23927 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 38 eval/decoder/string-building token(s).
`stream_030_off0000d7cc.js` `763172bb83da378d3deb9ea0ef54110a601894bb66f84142953df111355e142d`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xD7CC	2372 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`stream_069_off0002076f.bin` `ff6d8bc6de358707b08f37d5433c715bbef1ebfa5fc4356805db9dabf823d5a7`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2076F	66088 bytes
`stream_071_off0003126c.bin` `3cd2e46a6d8b775ee4de04ea33e67a0149cd091e7eea9fff3e79afe1a7dcc848`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3126C	46086 bytes
`stream_081_off00038057.bin` `e078085dd90f92ea7edf1351330e3e50d0eacc950ec46ed1395f43f786ea3792`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x38057	50592 bytes
`objstm_0003_00.bin` `9140aa4efcd371f2d9236c0f04a3c2d082b7a7496b7641d4441bce6d4af0e776`	pdf-objstm-decoded	PDF /ObjStm 3 0 obj (inflated)	10455 bytes
`objstm_0024_00.bin` `3d6212aaa90b2d7fada20e93a7ea054f722c17c2eeb33359166d815b19d81d09`	pdf-objstm-decoded	PDF /ObjStm 24 0 obj (inflated)	30169 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`objstm_0025_00.bin` `d82321077e974f67b8dad8194a827e01271b16ffa1725f6d24a484e3b6ce91a7`	pdf-objstm-decoded	PDF /ObjStm 25 0 obj (inflated)	34050 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`font_00_cff_off0002b919.bin` `fe0bcb30e9a9a9037476dd17ce284fa1d88fc717b8bad894c8d8e66e42edd80b`	pdf-font-stream	PDF embedded font (cff) at offset 0x2B919	44052 bytes

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