PDF malware analysis — malicious · 2718a937b202c346

MALICIOUS

PDF

946.7 KB Created: 2010-06-11 23:23:27 +08:00

MD5: f36f2154cb056645e2a2541bf30fa715 SHA-1: 5f57731966571a30af1d536b291b10cebfa630c8 SHA-256: 2718a937b202c34675c3e265da0153419bbc9b2d16ff83d547fd27803d286872

126 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript and RichMedia (Flash) content, strongly indicating an attempt to exploit vulnerabilities. The ML classifier also flagged this PDF as malicious with high confidence. The presence of embedded files and JavaScript suggests a downloader or exploit delivery mechanism. The benign URLs found are likely standard PDF metadata namespaces and do not indicate malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

Heuristics 9

RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (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
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)
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
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://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 11

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0001.bin` `e405650d4ac92f5d47e585a337bd79a9a50dd76330cdb18692dcecff6596f2ff`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0x1293	163 bytes
`embedded_file_obj0002.bin` `9f71924d3a4a7f2af4b395c8c7b67019dd7e7dd934e3d0d6b494a5b381409a40`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0x1384	1590 bytes
`embedded_file_obj0003.bin` `177b2fc50ec490fd5fb84b3903495957db47c0300b5d544fb80c9dac46ec11e8`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0x167E	4685 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`embedded_file_obj0004.bin` `e893fc6010e845f2d992671bea3fe5dbb18bd6d442b5e3f98d9a1f1599fafd25`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0x1EB5	199 bytes
`embedded_file_obj0005.bin` `c8a82f67dfd8d68c2f8fe494ca2deee4604701c8f02863bf87d222b992e45de9`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0x1FA3	2955 bytes
`embedded_file_obj0006.bin` `4cb349134bdb5f1a1c03281df9b53128ebe947f235398a912a4f0a9f638b24d5`	pdf-embedded-file	PDF EmbeddedFile object 6 at offset 0x231D	200 bytes
`embedded_file_obj0007.bin` `4f314214dac46fadf84f817c59256b3dc06f17a651fa21d3e6824e2f7fe0db56`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0x2410	835 bytes
`embedded_file_obj0008.bin` `4a60a9864cdf7382475d51051a03fdc43b32c31eb508893ccfccece34957f9f1`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x25E9	56 bytes
`stream_002_off000003d8.js` `529357503ec67b623d2a12816cdeea62bd639f2b4ff4e568b01c96cc3f5bfc6f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3D8	1363 bytes
`stream_003_off000005b5.js` `e985b5df65c8c3cf732a9074b575fbc594c1c7f0bccc0994182ec7e5c0f7308a`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5B5	902 bytes
`objstm_0046_00.bin` `846810dcc7a8789df1cfb48c038d06af1eadfa8ce2aeafffc8856a14cf082307`	pdf-objstm-decoded	PDF /ObjStm 46 0 obj (inflated)	1809 bytes

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