PDF malware analysis — malicious · bb4b63d0006d9d58

MALICIOUS

PDF

636.3 KB Created: 2010-12-26 21:13:41 +08:00

MD5: 297b4c77266cd9c71c0166c1d7dacc5a SHA-1: 23f5c8b2c30116efaa354364024a2b8886fe0414 SHA-256: bb4b63d0006d9d58084edc9bbc3d3dc6ef3f5b2c12442671f9517b0f6d116764

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged as malicious by an ML classifier. It contains embedded JavaScript and an embedded file, which are common techniques for delivering second-stage payloads. The presence of these elements, along with the 'ML_NYX_PDF_MALICIOUS' heuristic, indicates a high likelihood of malicious intent, likely to download and execute further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9435

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
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)
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic (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
`embedded_file_obj0001.bin` `f7ee3ef2f8f35d669a6c2b8b0b0ee89655bbc3d04b107a8d22531830f6fc28a1`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0x4497	86 bytes
`embedded_file_obj0002.bin` `5a55e676fbfa6c4799ed03376591e1b59740f36a9b7c1d6b186de88c8a293a94`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0x454A	1460 bytes
`embedded_file_obj0003.bin` `9c15ce56b0ff0b108ea249f3153aa42d309fb157afa20d1dae4bbb79320142c6`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0x4807	7392 bytes
`embedded_file_obj0004.bin` `da19a956510de42d8522c11b25445b3efa52056541ed94d34b6ccf27c6a9ff47`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0x536A	159 bytes
`embedded_file_obj0005.bin` `7a3baf6cd7005199e771f5fac95d2162e961b145b52976bfa7d0f32a10c9758d`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0x543D	3023 bytes
`embedded_file_obj0006.bin` `4cb349134bdb5f1a1c03281df9b53128ebe947f235398a912a4f0a9f638b24d5`	pdf-embedded-file	PDF EmbeddedFile object 6 at offset 0x57CE	200 bytes
`embedded_file_obj0007.bin` `e9d42684895eb3d2f59193e993cdf76a57032a413f7d1d253d7c1c6cab4c0e20`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0x58C1	835 bytes
`embedded_file_obj0008.bin` `4a60a9864cdf7382475d51051a03fdc43b32c31eb508893ccfccece34957f9f1`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x5A99	56 bytes
`stream_002_off00000352.js` `f574e4d51594d1a8fd22e125b109b827c437aa898edc78babb62dbb93f8744f8`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x352	1532 bytes
`stream_003_off0000053d.js` `4a1aca004cf20431c9a66dce85404a6411a54d881a6c257882260ffc972a13eb`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x53D	870 bytes
`stream_021_off00006124.bin` `1bff43e0d231e3e26ca1d9fb684837e370e07dca34e3d8d00878342f76266b59`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x6124	591087 bytes
`stream_023_off00096c2d.bin` `0601c4b533d97a420b6c976136126d6e4d79c0f357e07bcf80adaf2c57144440`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x96C2D	32400 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.74, consistent with packed or encrypted content.
`objstm_0040_00.bin` `402a910cdaf19a5d43a30d58c91c0cdfd24fbd39392423afe425e3cf62f7712f`	pdf-objstm-decoded	PDF /ObjStm 40 0 obj (inflated)	1928 bytes

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