PDF malware analysis — malicious · 96110d110bb5b1d5

MALICIOUS

PDF

52.8 KB Authoring application: sli

MD5: c0f60b1bd310dbc9895a7b4f0a937ff8 SHA-1: 8847c36196312883c5665f2da33b4eb6327b534d SHA-256: 96110d110bb5b1d5475296921aa4186f3a934894188629c81c5f053e678dce01

378 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File T1059.001 Command and Scripting Interpreter: JavaScript T1059.007 Command and Scripting Interpreter: JavaScript

The PDF file contains multiple critical heuristic firings indicating exploits for CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992, all related to embedded JavaScript execution in Adobe Reader. An embedded JavaScript file, 'array_char_table_stage_000.js', was deobfuscated and appears to be the stage for launching these exploits. ClamAV also detected the PDF as 'Pdf.Exploit.Dropped-91' and an extracted JavaScript artifact as 'Js.Exploit.HTML-28'. The primary function appears to be exploiting PDF reader vulnerabilities to execute malicious JavaScript, likely for further payload delivery.

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)
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: Pdf.Exploit.Dropped-91 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-91
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0076_000.js` `a90651f95920dde587925ec5e7a6d427284bc17d8198e300ecede5546a63f5a8`	pdf-javascript-stream	PDF /JS object 76 at offset 0x41A	52702 bytes
Detection ClamAV: Js.Exploit.HTML-28 Obfuscation or payload: unlikely
`array_char_table_stage_000.js` `7dd23a265cf0f62abead57fedc0f8d313336db21a8ac219cf7b879aabb4d4d49`	deobfuscated-js	array character-table decoded JavaScript at offset 0x42B	3848 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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