PDF malware analysis — malicious · a3da8dc874b541c4

MALICIOUS

PDF

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

MD5: 8f174ad8c3b15d8c7ebcfb0f44da41df SHA-1: 242ae30f66dae1bb54f3dc098291588b6c49564c SHA-256: a3da8dc874b541c488589a6f2e0b05e83fc1c08f333ea5c1937908121cfc3431

338 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659. These vulnerabilities are leveraged to execute embedded and obfuscated JavaScript. The deobfuscated JavaScript streams suggest the primary function is to download and execute a second-stage payload, consistent with a dropper functionality. The ClamAV detection further supports its malicious nature.

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)
ClamAV: Pdf.Dropper.Agent-7289233-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7289233-0
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` `ca1eb8d538b8ad0d974c6957716b6120975daf91a56ade09218299b577ec1f73`	pdf-javascript-stream	PDF /JS object 32 at offset 0x420	132 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0034_001.js` `235d2649d6edf4c8faf264683a023b746fc18632237d32430b7898b26a185d29`	pdf-javascript-stream	PDF /JS object 34 at offset 0x4DE	133 bytes
`javascript_obj0036_002.js` `4da9e0adc4476d8dd783bc004202ea16dd4fc6c44415837cfee1fbdbe7713ca3`	pdf-javascript-stream	PDF /JS object 36 at offset 0x105	148 bytes
`javascript_obj0038_003.js` `2f4712bfe35003c35920269176c34b216b3cc076a3cb8c3274c85bc446b0a938`	pdf-javascript-stream	PDF /JS object 38 at offset 0xC42	170 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0078_004.js` `3222177f36082989496e48a15ed73c944e4f30fd2be9bef1409114af9d3e7257`	pdf-javascript-stream	PDF /JS object 78 at offset 0x7C	43 bytes
`legacy_pdfkit_stage_000.js` `311f6133d83d323d9ca5ca499bceb39ee0e843e1f51cfcdf1f53690a6e8d43df`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x5D1	1634 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` `8da17a680c23b5387d87e81a4e8c7c8fd89c454773b367626f19416a4658f2db`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xD77	1800 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` `9f5e025fb32b4ad5556fb2a3f0b677fc74662c61b9c0e1db6caf568499a971e6`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x13E3	2938 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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