PDF malware analysis — malicious · e757cb76cf1a4aa3

MALICIOUS

PDF

44.6 KB

MD5: 2da5d077697ce900ce0e568449d16065 SHA-1: f0cfd859ad07a2c40458e1b91ae0c79abaf55b63 SHA-256: e757cb76cf1a4aa32c4d2300fb4762a8660d12e7adec296e70aaff05c2f2e2ba

166 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 JavaScript T1071.001 Web Protocols

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability related to `collab.collectEmailInfo`. The critical heuristic indicates that this JavaScript is a hex-encoded stager, likely designed to download and execute a second-stage payload. The presence of U3D content also suggests a potential exploit vector. Due to the obfuscated nature of the script and lack of specific network indicators, the family is unknown.

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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `53d3fcec7ada29de64fcdfb3e133a93e481deb1e6439ecd2d86ed6330d077682`	pdf-javascript-stream	PDF /JS object 9 at offset 0x43E7	440 bytes
`annotation_subject_callee_hex_stage_000.js` `821ae38560397c960d3c3f10c4435274aa125458fd33c0549e90cf451ad10171`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1BAD	5559 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `db2f11d58521976c4ead7a646358b4b985856c453e2519ddf5e284e6dbd55bdc`	deobfuscated-js	PDF JavaScript deobfuscation pass	225042 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off00004621.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x4621	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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