PDF malware analysis — malicious · 2bfd4e3a5b0509a6

MALICIOUS

PDF

2.60 MB Created: 2006-11-07 11:49:36 -07:00 Authoring application: Adobe Illustrator 11.0 (via Deep Exploration 5 5.0.6.1867 Release)

MD5: f1836d91b24a9e36f44240783e365f19 SHA-1: d2d9ca1c1381921a9edf2f3aaf0045a46756b7a3 SHA-256: 2bfd4e3a5b0509a643887d71e4a7f2eaea4129d06a7c36863745d932729c7151

204 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment T1071.001 Web Protocols

This PDF sample contains multiple high-severity heuristic firings indicating embedded JavaScript with obfuscation techniques like eval() and unescape(). The presence of U3D/3D content also suggests a potential exploit vector. The embedded JavaScript streams are likely responsible for downloading and executing a second-stage payload, although the exact nature of the payload cannot be determined from the provided evidence. The ML classifier strongly indicates malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9796

Heuristics 10

U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
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)
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.
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.
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)
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
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://ns.adobe.com/xap/1.0/g/img/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 30

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0256_000.js` `f180e9c2a491686a53f8958784c0564b894e421d9af9f06a38358e067ef565a7`	pdf-javascript-stream	PDF /JS object 256 at offset 0x3F0D1	277708 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_036_off00026b35.js` `5c8b515f8fb35d2cc50e300d03f0203980fba1aa3a80728eb5408e4a9ef5211b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x26B35	22212 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_037_off00027bd2.js` `f8b13a3863af702dcd7e3941443dec10025d7a2a53f54e108dfaf2b8e3f2695f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x27BD2	17918 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_038_off000289d5.js` `67fdedd6cb9a0e0b6e0eaba2f238ca5c983512f99a2092d586e4edea586be475`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x289D5	10626 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).
`stream_042_off0002b130.js` `e268c3fa8753a7b53b3db467a54c42b8f9036543a6f7b6d4f1d02ccd59df16d3`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2B130	7253 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_043_off0002b8a8.js` `77066a7a37b3af6ad53791d7f9457b7dfed3a8d84d4feaa7031d8ae355636408`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2B8A8	2855 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_044_off0002bccd.js` `a1069b624d829f9ed15ef9dc70c98d2a23233bb0b080385f34e121a533ca365a`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2BCCD	10387 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).
`stream_048_off0002e15f.js` `09a1f6366bade2c781cbaf923095ea7085f8de7adb3a8c0b0b708123787b545f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2E15F	7240 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_049_off0002e8e6.js` `962623957d02896ce50ac303e11139789b7c547ef6f635834872fbf3a740a5c4`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2E8E6	2629 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_050_off0002ecf3.js` `252ea1aa6e45985d77ac5ab2582980690ed57e9f198ae81a80a56806c03a8ae3`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2ECF3	10231 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 eval/decoder/string-building token(s).
`stream_054_off0003221c.js` `9796998ca2c32756bf181ff5f4a60580d6fd55561b2050ddebc355d20055f667`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3221C	7036 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_055_off00032991.js` `2a7255a2847947efcf8ff75cb73e57c1238de0b56ef725e3acb574238a620505`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x32991	2680 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_056_off00032da8.js` `34e199a7c93f33d1bb6f18620c86cff5d7bc5c68e1809e942ed0f3c0dc1515f9`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x32DA8	10563 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).
`stream_060_off0003529b.js` `12da33232a02682161413374f6f05c0210833edfde1a8ef6373b058eab29c831`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3529B	7349 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_061_off00035a45.js` `e35d38f817cd62db5a1f4554fb99f1e4ac0bd5e7e17c19dc1ad0afd56261c2cd`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x35A45	2699 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_062_off00035e58.js` `f99b25026b97bbf0ee754128febcbd6731b4870a0b207a825858361537edb519`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x35E58	10656 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 10 eval/decoder/string-building token(s).
`stream_066_off000381bf.js` `f61d6d78585bf688bcd9976ab48d95b3ceeff76f145e26142d53f0c3f6f91422`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x381BF	7516 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`stream_067_off0003896a.js` `835ae1930debae0ff9f45f4d3af42c9838d14fc0ce7262bdf9b42f507a2f12bb`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3896A	2623 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_068_off00038d7a.js` `0d67705a6bb1b0b689ce8dc5c8e2647f9ac5b389b7b962dac06623e78c805ec9`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x38D7A	10376 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 eval/decoder/string-building token(s).
`stream_072_off0003b4be.js` `f1b809fcabd36a7b044d90b6113a89fff86070ac264f8499b1c49f20c8e11036`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3B4BE	7139 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_073_off0003bc5c.js` `8cf818474745e275d3a361ee51a325ca2da34fa2d6266b93bd6469334fb63052`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3BC5C	2719 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_074_off0003c07d.js` `edf99511724f2fa86783da015818f61810939ca447b807b0b8c274f911c20ef9`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3C07D	10455 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 10 eval/decoder/string-building token(s).
`stream_078_off0003e3a4.js` `0e39b508c23e49751ef8144517c5ab068efcd2c2e8347b74a648b3adeb7cf172`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3E3A4	7219 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_079_off0003eb3c.js` `575b0ab544d9a1d0fd5b4052fc85e291b9e65138e37005f64035bcb6a2a084bd`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3EB3C	2721 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_081_off0004c0ca.bin` `1d949b4321e72a941028eedee52035a8ed5590fec17ffb3c67b4d01837e6c025`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4C0CA	2859872 bytes
`stream_082_off0023df41.js` `dbc1dbabdc2baf9bc8781d47cac49ae28057fb9c8f16acebe21aed846f3a46bb`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x23DF41	172124 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`objstm_0267_00.bin` `0b0d272b75744fd65991a38e8edb55466d01fd4d5d2b1b775dca99da7e73f4d9`	pdf-objstm-decoded	PDF /ObjStm 267 0 obj (inflated)	524 bytes
`objstm_0268_00.bin` `b14cf8625cf28a62dd3ffa238b71372931928293b97cb4018cae9e713c2ab27e`	pdf-objstm-decoded	PDF /ObjStm 268 0 obj (inflated)	3871 bytes
`font_00_sfnt_off000010ef.bin` `f39f99e2d4b021d4eac703afe26d32ad26f128c442f2089910c21b1f323fc85d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EF	79301 bytes
`font_01_cff_off0000ed7f.bin` `ff2bd39b1311329d9bedf20dcc32a5c5691647192c7f1c6f455126503a909ee9`	pdf-font-stream	PDF embedded font (cff) at offset 0xED7F	1558 bytes

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