PDF malware analysis — malicious · 2937c7ff43780376

MALICIOUS

PDF

4.1 KB Created: 2009-09-03 19:41:90 Authoring application: Eblasha 8.2.5.5 (via PDF Library 8.4.7.5)

MD5: 434e1eed0da1d2b1149ffaf9c76dbd40 SHA-1: 3f4cc6be1caaf7a87b0aae79bc96db495c6d8b24 SHA-256: 2937c7ff437803767ecc92f97caba619769df7ee7f9438acfe0ade4d3e115b83

304 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file exploits CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 by leveraging JavaScript embedded within the document. The primary mechanism involves decoding a numeric character-code string which is then evaluated as JavaScript. This JavaScript payload, identified as 'numeric_charcode_stage_000.js' by ClamAV, is flagged as a known exploit. The attack pattern is consistent with a PDF-based exploit delivery, aiming to compromise the user's system via the embedded script.

Heuristics 8

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)
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.
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.
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.
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `95d0bf6cd9f0a9707653288344f35af15a3485a03c635ba8d0ddc8f827963710`	pdf-javascript-stream	PDF /JS object 13 at offset 0x37C	16732 bytes
`numeric_charcode_stage_000.js` `60599cd32ef5feab595dbf54dce7bfbbfe78bae97de6de32628d0e32d2733dbb`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x3C9	5028 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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