PDF malware analysis — malicious · 3f0b883ece2b7e44

MALICIOUS

PDF

451.9 KB Created: 2006-11-13 18:07:16 -07:00 Authoring application: Adobe Illustrator 11.0 (via Adobe PDF library 6.66)

MD5: 2a4f0d5d1d2dc8dff3000fc40f3d4aea SHA-1: d273756e35216192ea57b0991fbcb79716ba8efd SHA-256: 3f0b883ece2b7e441103900665f689f97755f104ae65787454990106ab2f8667

150 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains multiple embedded JavaScript streams, several of which were flagged for obfuscation techniques like eval() and unescape(). The presence of these JavaScript actions and embedded script payloads strongly suggests the document is designed to execute malicious code. The primary intent appears to be downloading and executing a second-stage payload, as indicated by the heuristic firings and the nature of the embedded scripts. No specific family could be confidently identified due to the generic nature of the exploit.

Heuristics 11

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.
Additional-actions dictionary low PDF_AA

PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)
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
AcroForm button with action trigger low PDF_ACROFORM_BUTTON

PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
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://ns.adobe.com/xap/1.0/mm/
- http://purl.org/dc/elements/1.1/

Extracted artifacts 24

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0197_000.js` `acd6244460873bfdf8c84155b55e9873f457aed088cf4e27f87aa67a1a5f0137`	pdf-javascript-stream	PDF /JS object 197 at offset 0x49A82	23881 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`javascript_obj0200_001.js` `c37678945a32ddd6d14330812f6555e409e97a7d6be74c29298245d527cea542`	pdf-javascript-stream	PDF /JS object 200 at offset 0x4B4DC	7131 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`javascript_obj0202_002.js` `60f7dc10ce4582ab06e8dba17c351f255e7f4e9909d88d50ec31213cdf9b6be0`	pdf-javascript-stream	PDF /JS object 202 at offset 0x4CE1C	12428 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`javascript_obj0203_003.js` `1c80b1fcfa1a882440def46b1e6406af32dd4a56499b144c09c13572bed8879c`	pdf-javascript-stream	PDF /JS object 203 at offset 0x4D924	5368 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`javascript_obj0207_004.js` `70e19c3af78739072cf0c51dfe5e6d2d74ba439663b3b3757c66446c7ef081d2`	pdf-javascript-stream	PDF /JS object 207 at offset 0x4F47C	8402 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0208_005.js` `ec51594e4b6802de4c6d4cb9a3c0b77804bd8b541ea779adadc994ae123b0501`	pdf-javascript-stream	PDF /JS object 208 at offset 0x4FCB4	12178 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`javascript_obj0209_006.js` `6caa7dd98eb42d21b7ee6ae5fc317a8bfdb2e8983d02710a0b5928bc4c878992`	pdf-javascript-stream	PDF /JS object 209 at offset 0x506D3	1632 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`javascript_obj0219_007.js` `4d7c4e5dc99001e77d0dea36f8cb3703c863ddc6ad281286d72a2f41f59ae98b`	pdf-javascript-stream	PDF /JS object 219 at offset 0x58783	44812 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`javascript_obj0220_008.js` `e2290a81b586bac2c892ba2299416d09668e12e9e0e98958692a38354c69721d`	pdf-javascript-stream	PDF /JS object 220 at offset 0x5A62D	9013 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`javascript_obj0221_009.js` `acdd026b272c4fcf9dcbfa94681436b9c70cf2805369bdb363ed10c3e4161b75`	pdf-javascript-stream	PDF /JS object 221 at offset 0x5AE23	1796 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`javascript_obj0223_010.js` `265a639a8cbe3cfd38ecad67b2efc469e897aa02dfacdb3d3084587b464cb618`	pdf-javascript-stream	PDF /JS object 223 at offset 0x5BFFC	17210 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`javascript_obj0225_011.js` `4c00428ae36f5ca7a5c5c499a71c521009015460210cae87312362c2443321da`	pdf-javascript-stream	PDF /JS object 225 at offset 0x5EAE7	29588 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`javascript_obj0226_012.js` `cdf52350da1741bfffa96552d7abc9b2fa3ed2fcd7f6dbba6eeb747d9bd5d07a`	pdf-javascript-stream	PDF /JS object 226 at offset 0x60012	5859 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`javascript_obj0227_013.js` `37f8a07e2b4ad30ea896a939ff158bfa56c47ebf7db14a1e7960aae4569b20f5`	pdf-javascript-stream	PDF /JS object 227 at offset 0x6065B	1912 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`stream_050_off0004864d.js` `d9a00bae7f9b4a73d28810c0596afc4684ed9b978ed91afc480c36218b32340d`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4864D	28204 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_052_off0004ac80.js` `a6ad86a483aebeef23a7a78a561460281eaa4044d00d1444d58691b626f4b0b8`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4AC80	7720 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_054_off0004bccd.js` `cb36499b7c0a124d929629c2cc1bff04fb13abc77a80ad168c858bf459b6220f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4BCCD	18421 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 10 eval/decoder/string-building token(s).
`stream_057_off0004dfbc.js` `af85a00d5afdac67c61116cfb59f33c5720abbdd7dab1e81ecd6278b0ca3ff7f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4DFBC	26144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s).
`stream_069_off00055f31.js` `20813868ff5924a446b9a1ca93a0f8ca1937ae3a86932db3b02a61aed190f58f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x55F31	56410 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 14 eval/decoder/string-building token(s).
`stream_073_off0005b1a4.js` `1c2f8fa58b8f5992b85b8bcec7fcdca2948e972bc8a7c32103c96cc2690ff776`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5B1A4	17888 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_075_off0005cdd8.js` `c0ea2ae0aa0256cb6262856194675d8f3506242b0c10dad1b02c3d058de4a98a`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5CDD8	38073 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 16 eval/decoder/string-building token(s).
`font_00_sfnt_off000026cd.bin` `d6c87a9ca199ae8ba090d0572b93dd998834c9c653719de43d2ecc5b209048e7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x26CD	80690 bytes
`font_01_cff_off00012ebc.bin` `ff2bd39b1311329d9bedf20dcc32a5c5691647192c7f1c6f455126503a909ee9`	pdf-font-stream	PDF embedded font (cff) at offset 0x12EBC	1558 bytes
`font_02_sfnt_off0003a051.bin` `f39f99e2d4b021d4eac703afe26d32ad26f128c442f2089910c21b1f323fc85d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3A051	79301 bytes

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