PDF malware analysis — malicious · e9a39e09a3d800a5

MALICIOUS

PDF

1.95 MB Created: 2006-02-16 15:03:51 -08:00 Authoring application: sli

MD5: 222c71557c1245eefbf831418307396b SHA-1: 3b4b83332f57f5b3d1b7025efc979e0284689486 SHA-256: e9a39e09a3d800a51de25c67a90bb6feeea3884b239e8ee9beb35aefdea4dc7f

420 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell T1059.007 JavaScript

This PDF exploits several critical vulnerabilities including CVE-2009-4324 (media.newPlayer), CVE-2009-0927 (Collab.getIcon), CVE-2007-5659 (Collab.collectEmailInfo), and CVE-2008-2992 (util.printf). The embedded JavaScript, obfuscated using a character table, is reconstructed and evaluated to likely download and execute a secondary payload from a child PDF. The ClamAV detection 'Pdf.Exploit.Dropped-94' further confirms its malicious nature.

Heuristics 10

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.Dropped-94 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-94
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.

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0076_000.js` `c8cd866f7339c508d3aaa6fdb547645c96ee8be689053b9292f48e26f19e32f1`	pdf-javascript-stream	PDF /JS object 76 at offset 0x454	86267 bytes
`char_table_stage_000.js` `79d1a4e6d3fe04d35b44eb2a173210a68d7488fee65f1169965111dfc3ce3b78`	deobfuscated-js	char-table indexed JavaScript (raw) at offset 0x1AFFC	7218 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).
`javascript_obj0076_000_1.js` `9cb183eadbdf96641d4b0364c086dfd5fb25569d8c8186d4f7425a297b7000e5`	pdf-javascript-stream	PDF /JS object 76 at offset 0x454	86253 bytes
`char_table_stage_000_1.js` `a5a3a871f2372946717a385414e92e36e57e28032e1221a086c13b5f398b0bcd`	deobfuscated-js	char-table indexed JavaScript (raw) at offset 0x4E6	3606 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_off0001ab16.pdf` `1075706bb116d216934ac9a738e4c0515761539aa3c5f1fae77324d30ee8d8fd`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x1AB16	1938666 bytes

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