PDF malware analysis — malicious · 8595cf15815dbcd0

MALICIOUS

PDF

132.7 KB

MD5: 6fd2e3efb5b384d10f723f5d96eeab9e SHA-1: bd16c9e01247b9e8b116a9e8598e6e5e18f99519 SHA-256: 8595cf15815dbcd01acebc124d96559be5d62c4975e64372eede34ca4067c26e

456 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File Execution T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript that utilizes character-table indexing to reconstruct and evaluate code, exploiting multiple known vulnerabilities including CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. The deobfuscated JavaScript is identified as a stager, indicating its purpose is likely to download and execute a further stage payload. ClamAV detections further confirm the malicious nature of the file and its extracted artifacts.

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.Agent-36388 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36388
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.
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.
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` `ca5c33c3924d603ed7bc7696da1c34d34887177fbe22487b81f7535be25f219a`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2C2	119521 bytes
Detection ClamAV: Js.Exploit.HTML-27 Obfuscation or payload: unlikely
`char_table_stage_000.js` `99f232778f2e16c42e3e2e88a3f2f06d08b0c0b1f39b5accf301f7d26adcd870`	deobfuscated-js	char-table indexed JavaScript (PDF /JS object 76) at offset 0x2DC	3858 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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