PDF malware analysis — malicious · 21087d63d616f383

MALICIOUS

PDF

4.3 KB Created: 2010-01-26 04:58:58 Authoring application: a01136

MD5: 558208b248fa0c047a99a9eb0eaf3005 SHA-1: 146c5cd175308050b53968901567cd0185873e1d SHA-256: 21087d63d616f3832c4634ddf18b94165ad2044c6e8f631b923c95e63089c4b7

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript 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 through embedded JavaScript. An extracted artifact, legacy_pdfkit_stage_000.js, was flagged by ClamAV as Js.Exploit.Shellcode-18. This suggests the script is designed to download and execute a second-stage payload.

Heuristics 7

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 detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_000.js` `daf803918c7044ea9365816af4f27828fd9e0c4ae273ce06d8d81657982fda0f`	pdf-javascript-stream	PDF /JS object 12 at offset 0x20E	108 bytes
`javascript_obj0028_001.js` `1cfbde033f3a682fbde0ba507b3ed8918343248d14081d83d2d9ca9d78057669`	pdf-javascript-stream	PDF /JS object 28 at offset 0x2CC	337 bytes
`legacy_pdfkit_stage_000.js` `7b79a789141fec4d5ab99930d9f130e02689ad5bdccc7695497221a6bdcd1006`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x473	7398 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 15 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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