PDF malware analysis — malicious · e8f8d1d6e7a7fe8c

MALICIOUS

PDF

43.7 KB

MD5: a5557d51739d85b27ab87f67bb3b2b5d SHA-1: 746ac8767d2283e7def28aa7d80ca193a0e586bd SHA-256: e8f8d1d6e7a7fe8cfb8a90f305d63aed304eb9abbe5e9678e31c8669c6dd01ca

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF document contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability using the `collab.collectEmailInfo` function. This JavaScript is heavily obfuscated but appears to be a stager designed to decode and execute further malicious code, likely downloading and running a second-stage payload. The presence of U3D content and multiple deobfuscated JavaScript files indicates a complex exploit chain.

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` `a88effeedac91d214b40113051745ac3200454e9fa6fab2dc73f50293b682a17`	pdf-javascript-stream	PDF /JS object 9 at offset 0x4027	442 bytes
`annotation_subject_callee_hex_stage_000.js` `7c9ad1ed5a3452475b33c9f88a0328f19c4d977147fb27826c64b67d4971f922`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1A27	5261 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` `a1178b00bc3914b2933274ae77f32f75a86fd0d84f6b207a053c30fc72e6d000`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1A7B	11652 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` `632de67a2196a62147e9c1702b2cb1263cd5851e39f813e3c4f6f3105a093a71`	deobfuscated-js	PDF JavaScript deobfuscation pass	223293 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off00004261.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x4261	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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