PDF malware analysis — malicious · 08219b0298b9cc80

MALICIOUS

PDF

8.9 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 953afda7693b230724ad0cbb71684496 SHA-1: 032422ed4682428369cd457da6a3b812878e80f9 SHA-256: 08219b0298b9cc802d9ed2011b92ea4b5092664ade85d72cfe9ecd4a005923fd

590 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF sample leverages embedded JavaScript to exploit multiple known Adobe Reader vulnerabilities, including CVE-2009-4324, CVE-2007-5659, and CVE-2008-2992. The JavaScript code is designed to download and execute a second-stage payload from the URL http://arrmmani.com/bu1/news.php. The presence of shellcode and exploit cluster detections strongly indicates malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 14

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009.
Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits.
util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure.
Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCH

A single JavaScript body branches on app.viewerVersion and invokes two or more of the canonical Reader sinks (Collab.collectEmailInfo, Collab.getIcon, util.printf with a field-width format string). This is the 2009-2010 Pidief.J multi-exploit landing template: a per-version dispatcher that fires the matching CVE chain for whichever Reader version opens the file.
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT

One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL

Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
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.
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://arrmmani.com/bu1/news.php?dd=%253AA1A%257B_s3xstrz%253E%2540WoAe6uBepv%253F1S%2521I5%252FE05FX8X%2522%252B%252C%2522qg%255DmqBuaTu%2522n%252BmT%252Asmw%253AwIix%2522SuR%255Bl1%253B%252C6%253B%2522ZF%253Dd0by33TT2Q%2522bz%253Dyl9%2529%253Byn%25227K1Z3D4KD2CrSwV%25226%257Dg0C8%252B%2522u%2522HSe%2528Z%253C3%2522F%2529l%2522il
- http://arrmmani.com/bu1/news.php?dd=%253AA1A%257B_s3xstra%255Bi%2525DAe6uBep6ctT9iP%252FE05FX8X%2522%252B%252C%2522qg%255DmqBuaTu%2522n%252BmT%252Asmw%253AwIix%2522SuR%255Bl1%253B%252C6%253B%2522ZF%253Dd0by33TT2Q%2522bz%253Dyl9%2529%253Byn%25227K1Z3D4KD2CrSwc%25226%257DF1nE%252B%2522u%2522HS%255E%2560_e3%2522F%2529l%2522il
- http://arrmmani.com/bu1/news.php?dd=%253AA1A%257B_s3xstreGJ%2525jke6uBepCeM%2529n6A%252FE05FX8X%2522%252B%252C%2522qg%255DmqBuaTu%2522n%252BmT%252Asmw%253AwIix%2522SuR%255Bl1%253B%252C6%253B%2522ZF%253Dd0by33TT2Q%2522bz%253Dyl9%2529%253Bpn%25227K1ZizKKwgyg%252B%2528r9%25226%257D-lL%252B%2522u%2522HS%255E%255B4%25603%2522F%2529l%2522il

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `3357b680ab0eeddf4133db5fc2cc0a72027d40e35bc8c43733f585a888ff0a6a`	pdf-javascript-stream	PDF /JS object 13 at offset 0x390	7530 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).
`javascript_obj0013_002.js` `d18b9121825035139a02fed6c8b03d6d2874238278c2ae388b3326ebfb9ea7a9`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3B2	8120 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `d3f967a21f7b02188780fbc0b65653d06e9c14b97c953d2cae13833a2527dd05`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x390	7528 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `2afc9d099d06cf10f716978d5cb608db163f580cac06ee291b75010848794bb5`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 13 at offset 0x3B2	8118 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).
`generic_stage_recovery_002.js` `5088b83f550dccafd43968d42e0206b779451f35ea65646dbaa9de33506262b8`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0x16	15660 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 14 eval/decoder/string-building token(s).
`combined_document_js_000.js` `ce837b5fb81339fc8857ae59cbb305eb16c34aba1a5c3b052f3e154a1e0ea012`	deobfuscated-js	combined document JavaScript streams at offset 0x16	15664 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 14 eval/decoder/string-building token(s).

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