PDF malware analysis — malicious · 31efda27129e50bb

MALICIOUS

PDF

106.1 KB

MD5: 669022bdd892a15d54a95780304d5f9d SHA-1: 35aaf453a710cee745e1ebcd2ae0336ad0e630e2 SHA-256: 31efda27129e50bbc267f1e7d76535f338a964e7c6526fcdf6dea276eb8903dd

456 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/URL T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes character-table indexing for obfuscation, a common technique for exploiting vulnerabilities. Critical heuristics indicate the exploitation of multiple CVEs related to JavaScript execution within Adobe Reader, specifically targeting media.newPlayer, Collab.getIcon, Collab.collectEmailInfo, and util.printf. The deobfuscated JavaScript is likely designed to download and execute 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.Agent-36749 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36749
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` `5db5a374154249e200d5f154523ce648deaf76db9c43d3c3595128735ada22d1`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2C2	107745 bytes
Detection ClamAV: Pdf.Exploit.Agent-36749 Obfuscation or payload: unlikely
`char_table_stage_000.js` `ed9481801fc52b660e959659ba273510d0c4473040df9cf55f913e3249bd2b73`	deobfuscated-js	char-table indexed JavaScript (PDF /JS object 76) at offset 0x2F1	3864 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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