PDF malware analysis — malicious · 834a67589e2c5477

MALICIOUS

PDF

161.2 KB

MD5: a3cccf6c4f12261321cf55fda110c3f9 SHA-1: 3f088f578f9af9a3b03f3c7a728bfff73f7255d0 SHA-256: 834a67589e2c54778d072b6398667a5b512a826e9c79d8dfd1cc014444900af5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains JavaScript that utilizes an eval() function, indicating an attempt to execute arbitrary code. This JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the PDF_JS_EXPLOIT_CLUSTER and PDF_EMBEDDED_SCRIPT_PAYLOAD heuristics. The embedded file 'embedded_file_obj0106.bin' is a strong candidate for this payload.

Machine Learning

Nyx PDF Classifier clean score 0.0158

Heuristics 9

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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. (matched inside decoded stream)
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)
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://ns.adobe.com/xap/1.0/mm/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xfa/promoted-desc/
- http://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/2.8/
- http://www.xfa.org/schema/xfa-template/2.8/
- http://www.w3.org/1999/xhtml
- http://www.xfa.org/schema/xfa-data/1.0/
- http://www.xfa.org/schema/xfa-template/2.5/
- http://www.xfa.org/schema/xfa-locale-set/2.7/
- http://www.xfa.org/schema/xfa-locale-set/2.1/
- http://ns.adobe.com/xtd/
- http://ns.adobe.com/xfdf/
- http://www.xfa.org/schema/xfa-form/2.8/
- http://www.w3.org/2001/XMLSchema-instance
- http://cgi.adobe.com/special/acrobat/update

Extracted artifacts 14

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0104.bin` `a11e6b7b79362f60ad6c1b4fd416ea4b882406ae802afc80b49874ca032594f5`	pdf-embedded-file	PDF EmbeddedFile object 104 at offset 0xC8C8	163 bytes
`embedded_file_obj0105.bin` `815f0d20c35617be582e6d58010db0e77a3c179c04d7f52544736735ba0b67e9`	pdf-embedded-file	PDF EmbeddedFile object 105 at offset 0xC9BC	1996 bytes
`embedded_file_obj0106.bin` `3b8e41d3ad4ca11ce43051950767b6139ce5192905b8b0f83da548f52acbe529`	pdf-embedded-file	PDF EmbeddedFile object 106 at offset 0xCD5D	286007 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).
`embedded_file_obj0107.bin` `8f7c5ab54f868049d0b4225cd105709fab42364e2af88ad98f2262be600bf8e2`	pdf-embedded-file	PDF EmbeddedFile object 107 at offset 0x16BCE	2483 bytes
`embedded_file_obj0108.bin` `d14de2f1cb2f6f1caf8f940bcfe9060fc40cad804ee4101e76aa46a6a4b52ae1`	pdf-embedded-file	PDF EmbeddedFile object 108 at offset 0x16EDA	1576 bytes
`embedded_file_obj0109.bin` `500856001a9edb17a299f41c8b34871c12c85d56ec8eff03ef181fca24bb96b5`	pdf-embedded-file	PDF EmbeddedFile object 109 at offset 0x170C1	200 bytes
`embedded_file_obj0110.bin` `853755cbb5b71257ef28f08cb5825a33375555dc8f60cc8436345c5de885092b`	pdf-embedded-file	PDF EmbeddedFile object 110 at offset 0x171B8	1831 bytes
`embedded_file_obj0111.bin` `2ebdd7efeaa1190ff6bad8cbd649b313e3969564018f204e7385b97c2fab1e19`	pdf-embedded-file	PDF EmbeddedFile object 111 at offset 0x174E1	80 bytes
`embedded_file_obj0112.bin` `4a60a9864cdf7382475d51051a03fdc43b32c31eb508893ccfccece34957f9f1`	pdf-embedded-file	PDF EmbeddedFile object 112 at offset 0x1758D	56 bytes
`embedded_file_obj1440.bin` `17a650b357586088eb15bf2ef8ba901a177911fddfd658ec6fd795280ba4b363`	pdf-embedded-file	PDF EmbeddedFile object 1440 at offset 0x271E6	162 bytes
`embedded_file_obj1441.bin` `c60476dfbfafe53e592c08297556caaf44ca4902f9bed63dbb19558528ef4b8e`	pdf-embedded-file	PDF EmbeddedFile object 1441 at offset 0x272D9	1457 bytes
`stream_081_off00019bda.js` `529357503ec67b623d2a12816cdeea62bd639f2b4ff4e568b01c96cc3f5bfc6f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x19BDA	1363 bytes
`stream_082_off00019dba.js` `e985b5df65c8c3cf732a9074b575fbc594c1c7f0bccc0994182ec7e5c0f7308a`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x19DBA	902 bytes
`objstm_0114_00.bin` `a5286822065172144e1ba76e5566bf11bb641e7fbe58a591580b83e3efbe5f8f`	pdf-objstm-decoded	PDF /ObjStm 114 0 obj (inflated)	19509 bytes

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