PDF malware analysis — malicious · 8f99f0db4a4a1b87

MALICIOUS

PDF

134.2 KB

MD5: 2a74df6b82e7bf2423ac370a62827c3c SHA-1: cbe216e79a413dd3512eb5dbfbca1af77da60a98 SHA-256: 8f99f0db4a4a1b876c30e6c82099525e6966e8e9109a69ba6381107d7bf7bbe8

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file exhibits multiple indicators of malicious activity, including embedded JavaScript and an embedded file. The ML classifier strongly suggests maliciousness. The embedded file, 'embedded_file_obj0003.bin', is a primary artifact of interest. The presence of JavaScript actions and embedded scripts points towards an attempt to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9195

Heuristics 7

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/pdf/1.3/
- http://ns.adobe.com/xap/1.0/mm/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xfa/promoted-desc/

Extracted artifacts 13

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0002.bin` `c8a41472743d3d9fa27bd273882940194d1d7c41fccefa703955b9d4d1bf1581`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0x58	1856 bytes
`embedded_file_obj0003.bin` `7a924b420a6a8fe6be5ab7968e1910bffed53b9f6c60e05db642a907d9be4fc6`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0x3BD	411001 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s).
`embedded_file_obj0004.bin` `0cc1acb568122b202bf53805b12af93620ac5985e50247b10a974e6e1d27ad41`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0x1AA62	2920 bytes
`embedded_file_obj0007.bin` `2ac6dae4fac82721331c9e44dc903d0c773402198ff52d5b347d79af636e20f1`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0x1ADDE	640 bytes
`embedded_file_obj0008.bin` `708184c3756f474163a7dc27c006d265992f62c1eabef6b340d7c91a4b8aeac8`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x1AF5F	29525 bytes
`embedded_file_obj0009.bin` `642ebd21fa554fcf77fe3ed46ebeed5f4ee1777b99b4d17a848c825cbf9e4c0f`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x1BA61	1535 bytes
`embedded_file_obj0010.bin` `2ebdd7efeaa1190ff6bad8cbd649b313e3969564018f204e7385b97c2fab1e19`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x1BD24	80 bytes
`embedded_file_obj0056.bin` `6fa3678fdee168a7a81fb992dc3a271bddcc1ae903903c1d80edfc762841b917`	pdf-embedded-file	PDF EmbeddedFile object 56 at offset 0x1D6BE	162 bytes
`embedded_file_obj0057.bin` `b5be3c30d2880f83251f1ffa8b862765f3ccbc766901a061b331e157098c6658`	pdf-embedded-file	PDF EmbeddedFile object 57 at offset 0x1D7B0	3189 bytes
`embedded_file_obj0058.bin` `d4a16b79da6bc8beb7b0e33cbbf09a9899d93ed09506f0501aeb84088487baee`	pdf-embedded-file	PDF EmbeddedFile object 58 at offset 0x1DAC2	13902 bytes
`stream_007_off0001ce3e.js` `f94e41f586bf3f20bc1deeac4bfbda388a61db43f25fbd6304ba73f5653368cf`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1CE3E	1313 bytes
`stream_008_off0001d01d.js` `1b2ec98752b966f601d5223a750559cf13d562ac5e5c6d1fcc7217835b01f5fd`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D01D	902 bytes
`objstm_0060_00.bin` `407b57f1135925ec116f51a8c9e91c0e98dc2fe589ae7c5f5c137b84c9686e04`	pdf-objstm-decoded	PDF /ObjStm 60 0 obj (inflated)	7043 bytes

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