PDF malware analysis — malicious · ebbb31d7e4225f01

MALICIOUS

PDF

11.8 KB

MD5: d5b9574801deb5179c0a2e83fa077ad6 SHA-1: 8e8547f35e5ac58a8ee91d29b34f8f89e899164a SHA-256: ebbb31d7e4225f01e248e40372deaea6848f144f96ccd1e62bb8a979a8a82acb

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The sample is a PDF file that leverages the CVE-2007-5659 vulnerability through the 'collab.collectEmailInfo' function to execute embedded JavaScript. The JavaScript is heavily obfuscated but appears to be a stager designed to download and execute a second-stage payload. Multiple deobfuscated JavaScript files were recovered, indicating a complex execution chain. The presence of PDF-specific heuristics like 'PDF_JAVASCRIPT' and 'PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER' strongly supports this attack pattern.

Heuristics 7

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)
ClamAV: Pdf.Exploit.Agent-36063 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36063
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `eb39e2de4dbbc100de6d3e30aa43ff78fa075618862ba1ebba5151ea3a3b848d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	273 bytes
`annotation_subject_callee_hex_stage_000.js` `fced6904ffb0f8eda292a5f7119aeb960d55dfa7db7c6736e4eeb31a62b0cee4`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5012 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `279b7c838ef0399185aa2c447b8d61afc1747af175092190e63e8c625b951d7e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	11942 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `82d92bb41589a4d8162c7ec195692aba1fdc3c23ce613ad556f56caa820bbb79`	deobfuscated-js	PDF JavaScript deobfuscation pass	70032 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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