PDF malware analysis — malicious · bee1a8158c2c54d9

MALICIOUS

PDF

12.3 KB

MD5: dec2d0fad654251f8c88287755163148 SHA-1: e4bd71936b87e1547dd61311f4cbc02a1c1348ba SHA-256: bee1a8158c2c54d97f96951c7455faa9c84eeac18e06d5a94b8bd515737253cb

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious Link T1059.003 Windows Command Shell

The PDF file contains multiple embedded JavaScript streams, including a large deobfuscated script. Heuristics indicate the exploitation of CVE-2007-5659 via the Collab.collectEmailInfo method, which is used to decode and execute a hex-encoded stager. This stager likely downloads and executes a second-stage payload. The presence of multiple deobfuscated JavaScript files suggests a complex, multi-stage attack.

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` `9a7057ca32a49b5e5f2fe3a11c710bfdea2890dadbddc4e34baa9e02c8434378`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5298 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` `de4df3fb88c4370d665951e5c3284234bc41f24d012dd0292c858fe7009a4ad7`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12508 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` `ece2ce6bee1c7c00a4c4412c6052a84efdc8648564abb20a756329e69aa2b921`	deobfuscated-js	PDF JavaScript deobfuscation pass	75002 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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