PDF malware analysis — malicious · bc81ffeef543ca23

MALICIOUS

PDF

44.6 KB

MD5: e6d687bce33712051451e9b5cc92663e SHA-1: 23dc8cfb0eb4bfbb9d18a48afff03e14f88c680a SHA-256: bc81ffeef543ca232170f94a1015ee1668c0809cf84c4293138f317c3cc926df

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability related to the `Collab.collectEmailInfo` function. The embedded JavaScript, particularly the `annotation_subject_callee_hex_stage_000.js` and `legacy_pdfkit_stage_000.js` streams, is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The presence of U3D content also indicates a potential exploit vector.

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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `2ef86a3b80adf8ad5a17727efd7ed87651e8651ec17a9d259b332654bdcca199`	pdf-javascript-stream	PDF /JS object 9 at offset 0x43B0	471 bytes
`annotation_subject_callee_hex_stage_000.js` `ded2854cd1215a705ff486ededfcddb7ea7f2a7d07f39598618e0ab05960af7f`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1B83	5520 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `e4d71a5184fd80d6d7aca11d5084cd80c389f3d2f8d7d3c557ce43e9caddfc89`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1BD7	12351 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `784bbe9d48731b4f8fff2404f6c1f333b0890ad69a54452efbb46b1ef114cee9`	deobfuscated-js	PDF JavaScript deobfuscation pass	220350 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off000045f3.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x45F3	28021 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.79, consistent with packed or encrypted content.

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