PDF malware analysis — malicious · 4e004c7313d5c6b8

MALICIOUS

PDF

12.0 KB

MD5: 7c766f320084751a993ab6a1ff7c9888 SHA-1: 722ac4d2403e3b6b01b79bfabe4705a2d773e40f SHA-256: 4e004c7313d5c6b807734046b51fdd2c8e6e67b879d52f7ce9490ff58c0c6ca4

198 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. Critical heuristics point to the exploitation of CVE-2007-5659 using the 'collab.collectEmailInfo' function, which is a known method for executing JavaScript within Adobe Reader. The presence of deobfuscated JavaScript files ('legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js') suggests a multi-stage attack where the initial PDF acts as a dropper for further malicious code. The primary intent appears to be the execution of this embedded script, likely to download and execute a second-stage payload.

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 percent-decoding eval stager critical PDF_ANNOT_SUBJECT_MARKER_EVAL_STAGER

OpenAction JavaScript forces annotation enumeration, reads an annotation /Subject payload with getAnnots(), rewrites marker bytes into percent escapes, decodes it with unescape(), and dispatches it through eval. This is a high-confidence exploit-kit staging pattern. It is intentionally not mapped to CVE-2009-1492 unless getAnnots() itself carries the crafted integer or long argument shape for that vulnerability.
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `6f60a1053baafdc578f85eae84a2dc6d16775fbd66240d82cbfb7b4f4ff4e90a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	295 bytes
`legacy_pdfkit_stage_000.js` `905eb08cc26ed32a98c6c9d50e298175433a142d80495c1f09146d938e90eace`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E9	5096 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` `dd44f797306d2d2914f41e20c7ef27759de6a8a5c068070eb9288de3f507e6a4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E9	12230 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).

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