PDF malware analysis — malicious · df68525fa8f74aa3

MALICIOUS

PDF

13.4 KB Authoring application: Toldihiqanopo

MD5: 234f08836ecbb1019462b3384a186c43 SHA-1: 60555e610d71e80a3359eeda0af9b734d0de8551 SHA-256: df68525fa8f74aa3ec69503e6e84e41d84a64d3a0387862bfa3cf42cd1cda6b5

410 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF sample is flagged as malicious by multiple heuristics and a machine learning classifier. It exploits several known PDF vulnerabilities (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) by executing XOR-decoded JavaScript embedded within the document. The deobfuscated JavaScript, found in page_word_xor_stage_000.js, is likely responsible for downloading and executing a second-stage payload, as indicated by the ClamAV detection of 'Pdf.Exploit.Agent-36176' on an extracted artifact.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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: Pdf.Exploit.Agent-36176 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36176
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.
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_obj0020_000.js` `681fb8346e2ca0f375d9beeba24e43a3b31939102901566b68fd3c4bfab16eb4`	pdf-javascript-stream	PDF /JS object 20 at offset 0x29CB	284103 bytes
Detection ClamAV: Pdf.Exploit.Agent-36176 Obfuscation or payload: unlikely
`page_word_xor_stage_000.js` `f79cb6396492fc3f84d20f988f26cb4025557f9420c0051b290e67aa8c54f506`	deobfuscated-js	page-word XOR decoded JavaScript (decompressed, key=0x05) at offset 0x9E6	3215 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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