PDF malware analysis — malicious · 52bc3fa520310e2a

MALICIOUS

PDF

9.3 KB

MD5: bdbdd43391528b2907dc2e6936c78155 SHA-1: 8963485dfe8d9cf9f4dda689868f084353efb3fd SHA-256: 52bc3fa520310e2a42aa82884f4c5c9eb100363d19b55feaddd9e647e3c36863

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, triggered by the 'collab.collectEmailInfo' method, which is known to be vulnerable to CVE-2007-5659. This JavaScript acts as a stager, decoding a hex-encoded payload. The recovered JavaScript is heavily obfuscated, but the primary function appears to be the execution of a secondary stage. The exact nature of the secondary payload could not be determined due to the obfuscation, but the exploit chain is clear.

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 4

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` `9c83874f72fa5f67794fb4990570e48cb873444817673e267d019027ddcd84b9`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5215 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` `b6376ac22a57cb49644bc56bba29a790cb3b4b49bdd9d3e6ec7ca10d2cb63e20`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D0	12358 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` `67543fb7ef30b25f87b13c794d0709abf075fceff47f1bbc49ae8b32909684e3`	deobfuscated-js	PDF JavaScript deobfuscation pass	44303 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.