PDF malware analysis — malicious · 3af944b80ab3cffe

MALICIOUS

PDF

10.1 KB

MD5: 5888ec66a227f58ec50378d1015fd2a6 SHA-1: a4a9ac0834cd817165504e132e1ab60d245e3668 SHA-256: 3af944b80ab3cffeae1da8259d7accc81f95a54d1c76655b16727378303b8f3b

356 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes several known CVE exploits (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) related to PDF reader vulnerabilities. The JavaScript is obfuscated and uses `eval()` and `String.fromCharCode` to execute its payload. The primary intent appears to be the exploitation of these vulnerabilities to download and execute a secondary payload, as indicated by the deobfuscated JavaScript artifacts.

Heuristics 9

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)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Suspicious extracted artifact high 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.
String.fromCharCode medium PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically
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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0003_000.js` `cfe1bd0f8bef38f1b3fb0e3d567b47472f52a7939a01ba78cd95c34cca159cfb`	pdf-javascript-stream	PDF /JS object 3 at offset 0x2606	191 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`info_hex_offset_stage_000.js` `13120adb6d6ac392738fa0f3e1d9e2b8c73260afd973c8ad2413f0bbc63a1ed5`	deobfuscated-js	PDF /Info subject hex-offset JavaScript (raw, offset=-42) at offset 0x14	4819 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `e79d6ecc9e685038877849810a11162ca823070b4861afea6931d97b5ef9acf3`	deobfuscated-js	PDF JavaScript deobfuscation pass	393 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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