PDF malware analysis — malicious · 48a48ba8498a6eae

MALICIOUS

PDF

16.1 KB Authoring application: sli

MD5: 79b84e9ecd8a48eb9e4a972c5712df66 SHA-1: 93a852d46ae8cd65502eed91d4234b0bdb0a0682 SHA-256: 48a48ba8498a6eaea8023d211edef7bf9689be4857454c4358dc7076398f0f14

456 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Script Execution T1204.001 Malicious Link/URL T1204.002 Malicious File

The PDF file contains a highly obfuscated JavaScript stager that leverages multiple known Adobe Reader vulnerabilities. The stager uses a character-table decoding method to evade detection and ultimately executes exploit code. The presence of multiple critical heuristic firings related to specific CVEs and the detection of a malicious JavaScript stream strongly indicate an exploit attempt. The extracted artifact 'array_char_table_stage_000.js' is identified as a deobfuscated JavaScript stager, likely responsible for downloading and executing a second-stage payload.

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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0076_000.js` `c6c90e7d73b9d27a0c1ef168c95b4ecd0bb32967e65a43543de5a1f524186f37`	pdf-javascript-stream	PDF /JS object 76 at offset 0x3FE	15235 bytes
Detection ClamAV: Pdf.Exploit.Agent-36839 Obfuscation or payload: unlikely
`array_char_table_stage_000.js` `0bb560a4f2fc4cc59322bf2a3fb209383da9f628aca8fa93ad3f67d8f79feebd`	deobfuscated-js	array character-table decoded JavaScript at offset 0x42A	3854 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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