PDF malware analysis — malicious · 55933657b68e0b98

MALICIOUS

PDF

1.95 MB

MD5: ac38a8538db06c947aa3b106a9b1f75b SHA-1: 018451c04454fa0760f4e941057671c31a3d0cff SHA-256: 55933657b68e0b98975aa13461e3607f56d34e37bb7675e417cd5228a1e6b08d

418 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1059 Command and Scripting Interpreter T1059.007 JavaScript

This PDF file is malicious and leverages multiple critical vulnerabilities (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) to execute obfuscated JavaScript. The JavaScript, recovered as 'eval_char_append_stage_000.js', acts as a stager, likely to download and execute a second-stage payload. The presence of a secondary embedded PDF also indicates a multi-stage attack.

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.Agent-36333 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36333
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0076_000.js` `2cc2eaef290fdfee49fbfb67404bfdd641616f3f6f33ad099a0f541b8f0c86af`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2D4	53610 bytes
`eval_char_append_stage_000.js` `18a377f5416cd44034d5df76a72dbcbe818f1f9d38ffa02f80aaebd12e0ee7e6`	deobfuscated-js	eval character-table append decoded JavaScript at offset 0x305	3870 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` `12d39a2034bb03a3645bd787e5dbcffbcc740899a1f09a1a2f800a4581a93eaa`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2D4	45710 bytes
`polyglot_child_pdf_off0000f342.pdf` `742a547d128a8d73712d7485536b722dc8e60b8bcec0165f856afcd3ec74cbe6`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0xF342	1985726 bytes

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