PDF malware analysis — malicious · a90a41ac0f263a6a

MALICIOUS

PDF

9.5 KB

MD5: 20e5750f1e7123bd54a6c7da3365ed5b SHA-1: a7e8a4a9bc1c6cca49faa9aa3268b5f6144c49cb SHA-256: a90a41ac0f263a6a9aa2582087239f325c0c85efe35317c8e73c2e9d7b66f4b7

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File T1059.003 Windows Command Shell T1140 Deobfuscate/Decode Files or Information

The PDF sample contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE_2007_5659 heuristic indicates that the sample exploits a known vulnerability (Collab.collectEmailInfo) to execute a JavaScript stager. This stager is heavily obfuscated and decodes a larger payload, as evidenced by the deobfuscated.js artifact. The primary intent appears to be the execution of arbitrary code via the decoded JavaScript.

Heuristics 6

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)
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_obj0007_000.js` `9f17df95bc71874fe0f2dcb9f0e8f529cdb3604910d27079f2fbde52cabda2a8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	256 bytes
`annotation_subject_callee_hex_stage_000.js` `c9513977971f156452dbf3da391b5064687ddc359896f3167ba716faa8bf7ab3`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5137 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `c9158db95de965baf28379192fbe3fc35c2f28ecbef1454e22ed088b9332af2a`	deobfuscated-js	PDF JavaScript deobfuscation pass	45936 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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