PDF malware analysis — malicious · 324df516c907ab08

MALICIOUS

PDF

9.4 KB

MD5: d78dcf5841af6d50571d219cd1955cee SHA-1: 4b189cadcc9b5a7537b6671402f506e033431dcc SHA-256: 324df516c907ab08afe2a7b67d63c5d7f104a59691c84222086ba41a741a658f

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF document contains embedded JavaScript, triggered by the 'Collab.collectEmailInfo' method, which is a known vulnerability (CVE-2007-5659). This JavaScript acts as a stager, decoding a hex-encoded payload. The deobfuscated JavaScript is substantial, indicating a complex multi-stage execution process likely designed to download and execute a secondary payload. The presence of multiple deobfuscated JavaScript files suggests a sophisticated dropper mechanism.

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` `dc37160715dd481d0bf49e7af5079aad16ed0e66896c1ae05ca27000b3e4454e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	259 bytes
`annotation_subject_callee_hex_stage_000.js` `768fd5c5bee31a890fcf81fe0d5bccaaf76bdd039d89cd5eb1b8aaac6fcb46a0`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5007 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` `d8361f8974814456dd9572c3162de463d201bad328229c298dd34c4b059bf70a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D4	11831 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` `6ac0d18c03f02a790d1707910e3de268479498e3973592bf1480dff1482e6e24`	deobfuscated-js	PDF JavaScript deobfuscation pass	69458 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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