PDF malware analysis — malicious · 2f81e5487814874d

MALICIOUS

PDF

16.3 KB Authoring application: sli

MD5: b5264b360907ee9faf2f7d8cd678d0e1 SHA-1: 78472523ed8d27906d4718c59b9f5b8719da9d21 SHA-256: 2f81e5487814874d78b14b8d6fd39c9e9b185d03109ea7db4d1ba2e5fd412553

418 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains multiple critical heuristic firings indicating exploitation of Adobe Reader vulnerabilities including CVE-2009-4324 (media.newPlayer), CVE-2009-0927 (Collab.getIcon), CVE-2007-5659 (Collab.collectEmailInfo), and CVE-2008-2992 (util.printf). The embedded JavaScript, particularly the 'array_char_table_stage_000.js' file, is identified as a large character-table eval stager, a common technique for obfuscating exploit code. This stager is designed to decode and execute exploit branches targeting Adobe Reader. The ClamAV detections further confirm its malicious nature, identifying it as Pdf.Exploit.Dropped-91 and an extracted artifact as Pdf.Exploit.Agent-36839. The primary function appears to be exploiting these vulnerabilities to facilitate the download and execution of further malicious content.

Heuristics 10

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.
Large character-table JavaScript eval stager high PDF_JS_LARGE_CHAR_TABLE_EVAL_STAGER

PDF JavaScript contains a large numeric index array, a short character table, an indirect eval sink, and a long loop that reconstructs a hidden stage. This is an exploit-kit staging technique even when the recovered first stage is still encoded.
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` `15ec38daea2db1ddc1e8a6f0c4aaf9b143689ab2ab7826bd714a2e8bcd8656a9`	pdf-javascript-stream	PDF /JS object 76 at offset 0x3FE	15423 bytes
Detection ClamAV: Pdf.Exploit.Agent-36839 Obfuscation or payload: unlikely
`array_char_table_stage_000.js` `713a211cd3f85b76839dd025e5ab88da77deacb5ee35a2bab33de488385af7d7`	deobfuscated-js	array character-table decoded JavaScript at offset 0x42A	3878 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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