Win.Trojan.Agent-36331 PDF malware analysis — malicious · cb0247fe2f0d91cd

MALICIOUS

PDF

82.9 KB

MD5: 20a7430890c8d67b3055c19ccf94f0b0 SHA-1: c50bf0de5134ba4e4737be5632561ea5e4dd4d51 SHA-256: cb0247fe2f0d91cd1ff401e9388411c51867c30683c4a51e501684d7eb2ff916

360 Risk Score

Malware Insights

Win.Trojan.Agent-36331 · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes a character-table-based stager to exploit several legacy Adobe Reader vulnerabilities. The recovered JavaScript is designed to download and execute a second-stage payload, as indicated by the ClamAV detection of 'Win.Trojan.Agent-36331'. The exploitation of multiple CVEs suggests a sophisticated dropper.

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: Win.Trojan.Agent-36331 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-36331
Character-table JavaScript eval stager high PDF_JS_CHAR_TABLE_EVAL_STAGER

PDF JavaScript reconstructs an exploit stage by indexing into a small character table, appending hundreds of one-character fragments, joining the array, and evaluating the result. This static fallback fires only after the bounded decoder recovers an exploit-like stage, so it catches this obfuscation even when no single CVE API signature is available.
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` `f67f4b12ded3f6a2c714c12c5cb34139a2b0bc486d2c982c8b44f5882db25827`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2D4	76226 bytes
`char_table_stage_000.js` `6ff63617e24f77bc1185b1fcb73680978a3dd31bab5370ad2fd4a7544034c5f1`	deobfuscated-js	char-table indexed JavaScript (PDF /JS object 76) at offset 0x31A	3852 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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