PDF malware analysis — malicious · 255ba6cd438d2b55

MALICIOUS

PDF

7.3 KB Created: 2009-01-35 62:12:26 Authoring application: Adobe

MD5: cb58af5f0da5d8e3d6fcc855269a46c8 SHA-1: 366084f1d16fe651cfbfeebee3417df678a18da2 SHA-256: 255ba6cd438d2b5557a19b697511ab12a9ce47634a1c8e00cf1e4bcca825db76

308 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659. These vulnerabilities are leveraged through embedded JavaScript, which uses `eval()` and `unescape()` functions. The deobfuscated JavaScript streams suggest the primary intent is to download and execute a second-stage payload. The ML classifier also strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 8

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)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0032_000.js` `b8490d2a5ab92db3437379b22682944e8b0cd6941de1828eefb90c89368fbff5`	pdf-javascript-stream	PDF /JS object 32 at offset 0x427	134 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0034_001.js` `b8a9411f055e11b50e2a57c092c95ff380e19b8642a85c53d6c529607c7cf0c7`	pdf-javascript-stream	PDF /JS object 34 at offset 0x4E7	139 bytes
`javascript_obj0036_002.js` `97082439b093476d62bee8a9a269171d9c36eca54eedb5d2f9d665b9d6bd11dc`	pdf-javascript-stream	PDF /JS object 36 at offset 0x109	158 bytes
`javascript_obj0038_003.js` `daa354bad7639fa44f37a347fdee565157b6078dbcc21ed09040b0b91eadfe4d`	pdf-javascript-stream	PDF /JS object 38 at offset 0xC4E	178 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0078_004.js` `7a7dd3baba2c5bf3813baad22e86b1ec9b1db15dc37982cae1e42bb369b3952b`	pdf-javascript-stream	PDF /JS object 78 at offset 0x7C	47 bytes
`legacy_pdfkit_stage_000.js` `b2e581467bf11f1cda7841f535399ca8cf5f18b4ea8a9b313116d79eb6dd6a58`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x5DE	1622 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `8c3b226331a8a2d232a4cc72b974630e50e33b5f5de98e2fa80a3a31881fc4c2`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xD89	1788 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_002.js` `067232e5360e076dc3d6d89d14ad6e56bd2606d96e516099987b41ec6705bbdf`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x13EF	2914 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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