PDF malware analysis — malicious · 58e1fa43c095c851

MALICIOUS

PDF

4.1 KB Created: 2009-09-02 19:48:30 Authoring application: Eblasha 6.2.2.3 (via PDF Library 6.1.10.3)

MD5: cfd0c2e2da9a7a0f74d0451d77e7a708 SHA-1: fb5e2e28a75f05c1fdc4be0bb5ac3198d8241727 SHA-256: 58e1fa43c095c8514e1ac0c6cd1750fbcd0c9f2f28efb64a18dd9032789f7622

266 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file exploits multiple known vulnerabilities related to JavaScript execution within PDF documents, specifically targeting Collab.getIcon, Collab.collectEmailInfo, and util.printf functions. The embedded JavaScript, identified as 'numeric_charcode_stage_000.js', was detected by ClamAV as 'Js.Exploit.Shellcode-18', indicating it likely downloads and executes a second-stage payload. The use of ASCII85Decode filter and numeric character-code strings further suggests obfuscation to hide malicious code.

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.
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
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `24aaa60c191fe97fd05f3b2491fd83dc9389ff96ac940a0a4169c80e243c8be8`	pdf-javascript-stream	PDF /JS object 13 at offset 0x37C	16732 bytes
`numeric_charcode_stage_000.js` `0e444abdc13413185c2a4672ea3fbee59958b039fdccbce6833fa8ff018b5a9e`	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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