PDF malware analysis — malicious · a268f04088d41352

MALICIOUS

PDF

1.95 MB

MD5: f1ca86c1d71fddc6a848936bbd15b476 SHA-1: 05a0591e2a6d15e845f2f28e9fa818463c4fdf4a SHA-256: a268f04088d413528847ed70537ca4d720a77de0f048b31236c13401c41038f7

420 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious Link

The sample is a PDF file that leverages multiple critical vulnerabilities, including CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. These exploits are used to execute obfuscated JavaScript, which is further processed via a character-table eval stager. This JavaScript is designed to download and execute a second-stage payload, as indicated by the embedded URL and the nature of the exploit chain. The presence of a secondary embedded PDF also suggests a multi-stage attack.

Heuristics 11

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. (identified after JavaScript deobfuscation)
Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
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. (identified after JavaScript deobfuscation)
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. (identified after JavaScript deobfuscation)
Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
ClamAV: Pdf.Exploit.Agent-36395 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36395
Character-table JavaScript eval stager high PDF_JS_CHAR_TABLE_EVAL_STAGER

PDF JavaScript reconstructs an exploit stage by indexing into a small character table, appending hundreds of one-character fragments, joining the array, and evaluating the result. This static fallback fires only after the bounded decoder recovers an exploit-like stage, so it catches this obfuscation even when no single CVE API signature is available.
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://www1.savebikdefense.rr.nu/?8kk0srahu=XM7YlLDX2c2b6MraopeZnZWL2tnasJppoqBppqqRzKzZh%2BrYn5qelpebm6KslWyR16Owo5GYrJnC2MfUpr24sIzV19eia5HeVA%3D%3D

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0076_000.js` `8bd8ab1dc01036b1aa94bb47dbe64779af71663c25d929f100a169b5a6857932`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2C2	46048 bytes
`javascript_obj0005_001.js` `8dbd70b31e55b3d52b030a524fab991063a07a7e8cb38fc076139ea36b2758b1`	pdf-javascript-stream	PDF /JS object 5 at offset 0xD72D	14231 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`eval_char_append_stage_000.js` `2eeceaf99740b38a7114117e35cd19b56ad2edae435a3484f9d6a86e8c242b11`	deobfuscated-js	eval character-table append decoded JavaScript at offset 0x322	3858 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`polyglot_child_pdf_off0000d596.pdf` `00f0d04a673076b0191eb38c83217e55b781dedefd87bfe756b35d54dd820f16`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0xD596	1993322 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`polyglot_child_pdf_off00011004.pdf` `9a01e0d4f6c9c930df124df5ffa1269c2149a25da8660a5b963b3b808ab232cc`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x11004	1978364 bytes

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