PDF malware analysis — malicious · 20a0b0b900bf5693

MALICIOUS

PDF

42.3 KB

MD5: 7deccdc338519d80feeb1ef0098ba7d4 SHA-1: 3398dd11a09101beb27e40d6e2e22bfe97722369 SHA-256: 20a0b0b900bf5693b519f2a3c65b4f323bc32674fc75b605d7341bc25ce95efc

166 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: JavaScript T1059.003 Command and Scripting Interpreter: Windows Command Shell

The PDF file contains embedded JavaScript that is obfuscated and designed to be decoded and executed. The critical heuristic firing for CVE-2007-5659 indicates the exploitation of a known vulnerability in Adobe Reader via the `Collab.collectEmailInfo` function. The JavaScript stager, recovered as `annotation_subject_callee_hex_stage_000.js`, is responsible for decoding and executing a larger payload, likely for further malicious activity.

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)
U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `795764f2f24cd6e151be2c66ff2ec93437966e9bc41fccc1ca87acf4c2298a5e`	pdf-javascript-stream	PDF /JS object 9 at offset 0x459C	498 bytes
`annotation_subject_callee_hex_stage_000.js` `b9c8114cc972dc6cc8c63022aae32d7ab532fdae0e73bdab977698d00f6ee25f`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1BD1	5615 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `9aa4f1bcb2e6e94dc687996f3695bf57da0553b62be7deb593063e8e0de14dec`	deobfuscated-js	PDF JavaScript deobfuscation pass	207837 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).

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