PDF malware analysis — malicious · 9fb3c5c1c438223c

MALICIOUS

PDF

44.9 KB

MD5: 79794e377a6950489d62ca8014281744 SHA-1: 47c53e242caf61d3fbd564b595a51c407128860e SHA-256: 9fb3c5c1c438223c4c8c44ab224e70601402e63e56d617543c073e843c265f2f

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains embedded JavaScript, triggered by the 'CVE_2007_5659' heuristic which indicates the use of 'collab.collectEmailInfo' for JavaScript stager execution. The 'PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER' heuristic further confirms that a hex-decoded JavaScript stager is recovered from the annotation subject. This stager is responsible for downloading and executing a second-stage payload, indicating a typical dropper or downloader attack pattern. The presence of U3D content, while not directly indicative of the execution flow, is flagged as 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `35536860df4016ec3bb72c6ba20d15719a83250cd5ef7568b1faf5e782e24fd7`	pdf-javascript-stream	PDF /JS object 9 at offset 0x451C	439 bytes
`annotation_subject_callee_hex_stage_000.js` `95216d9ad00b8dccbc459c79e91ea425051c991cb1007d2b8bb0e73ea06fcecb`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1C16	5628 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `18b7c6c7cb8fe0bbdc50b62ce6731ac5df88a4af465970c0c256407fe82eb32a`	deobfuscated-js	PDF JavaScript deobfuscation pass	225290 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off00004757.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x4757	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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