PDF malware analysis — malicious · 6a722f8a56fb600c

MALICIOUS

PDF

97.3 KB

MD5: 83aa895c3dbed4246dcd6ae1af6e47db SHA-1: 501164bd054bfd9bf4a471067072e52e39168cbe SHA-256: 6a722f8a56fb600cc867210a988344fed24eadbedd1f5104988a5fb4f9c18326

368 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains embedded JavaScript that exploits CVE-2009-0927 (Collab.getIcon). The JavaScript is heavily obfuscated and appears to be a downloader for a second-stage payload, as indicated by the ClamAV detection on extracted artifacts (Js.Exploit.Shellcode-18). The ML classifier and multiple critical heuristics strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

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.
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Pdf.Exploit.CVE_2009_0927-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.CVE_2009_0927-1
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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `71ca4f631ba8465bdc772bcb6914bc3c6a5aac227e653490102024a36c1e858a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x297	98664 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `e2f3e0cbccfa1dbbaad79e32a819e5fbd1032435032ffbe7697854256909720b`	pdf-javascript-stream	PDF /JS object 7 at offset 0x297	96798 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `4aa12613e9e5059448efb1cf5a8613e23e11173fddb2acf477ab1bf85f473ecb`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 7 at offset 0x297	98656 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `51d61be086c91056fc16cec1fb1a2bb49a131dead0af49c94d38a71bd2067e45`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0x297	195455 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`combined_document_js_000.js` `7d6a2a91dcb1355e9feb3ce75041c769f51cf80290960b75a9be35bdbe0fc192`	deobfuscated-js	combined document JavaScript streams at offset 0x297	195463 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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